2024-03-29T00:24:23Z
http://radap.kpi.ua/radiotechnique/oai
oai:ojs.radap.kpi.ua:article/90
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/90
2024-03-29T00:24:21Z
N
No. 49 (2012); 166-177
Comparison of classical and conductivity zones methods for solving EIT inverse problem
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2012-02-27
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/90
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Comparison of classical iteration imagine reconstruction method and conductivity zones method properties in EIT from the point of view of calculation organization, expecting precision and computational cost of imagine receiving is carried out. Reasonably small transfer resistances sensitivity to surface conductivity changes of separate finite element is shown. Small sensitivity is appeared for finite elements, which are situated in the central part of phantom, and also for finite elements, which are situated in the phantom outline. Small sensitivity is the cause of derivative matrix bad conditionality, that is aggravated with big matrix order. It led to quantity instability by solving of inverse problem (reconstruction problem). Conductivity zones method allows to avoid some difficulties: leads to derivative matrix order reduction, increasing of sensitivity and matrix conditionality. Transfer resistances and derivatives values for uniform phantom and for phantoms with different inhomogeneities for assessment are proposed.
oai:ojs.radap.kpi.ua:article/92
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/92
2024-03-29T00:24:21Z
N
No. 44 (2011); 148-156
Development and prototyping of impedance CT scan for measurement of complex resistance distribution
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Movchanyuk, A. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/92
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Structure and concepts of impedance CT scan for complex resistance distribution measurements of EIT section are proposed. The prototype of the CT scanner and the results of modeling are represented. Tomograph allows the impedance measurements inclusive transfer resistance for building a phantom (output voltage module and phase shift between output voltage and sours current). This allows you to extend the capabilities of diagnostic imaging in biology, medicine and technology. A prototyping tool showed both the opportunity and the relative ease of creating hardware tomograph. Experience has shown the need to reduce layout instrumental amplifier noise using narrowband filters.
oai:ojs.radap.kpi.ua:article/107
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/107
2024-03-29T00:24:21Z
N
No. 50 (2012); 83-91
Determination of parameters of mathematical model of antenna connection with biological environment
Manoylov, V. P.; Zhytomyr State Technological University, Zhytomyr
Nazarchuk, L. Yu.; Zhytomyr State Technological University, Zhytomyr
2012-11-07
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/107
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The article is devoted to determination of electro-physical parameters of mathematical model of antenna connection with the environment of biological object. Principle of change of reflection coefficient near-by an aperture of antenna is used, which is an information about a change of dielectric permeability and temperature of biological environments. Expressions for reflection coefficient, relation of coefficients, conductivity and resistance as functions of many parameters are presented. Analysis of mathematical model « antenna -bioobject» presents the changes of reflection coefficient of radiation from the entrance of antenna, dielectric permeability of environment and conductivity. This method can be used in diagnostics of tumour diseases on the early stages.
oai:ojs.radap.kpi.ua:article/108
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/108
2024-03-29T00:24:21Z
N
No. 49 (2012); 178-183
Simulation of the normalized signal distortion monochromatic microwave generators
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yasinskiy, D. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2012-02-27
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/108
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We consider the disadvantages of monochromatic generators for microwave resonance therapy mm range, the main of which is a narrow frequency range. Proposed method for extending the operating frequency range normalized by the distortion of a harmonic signal of the reference oscillator with a further release of the second and third harmonics of the signal. In the process of modeling the level of signal distortion is used for the Fourier transform of periodic functions. As a result of simulation showed the possibility of optimizing the ratio of the amplitudes of the second and third harmonics are sufficient for the construction of wide-range mm-range oscillators used in the technologies of quantum medicine.
oai:ojs.radap.kpi.ua:article/115
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/115
2024-03-29T00:24:21Z
N
No. 50 (2012); 75-82
Human functional state definition by the multilevel discrete wavelet transformation of a pulse wave biosignal
Pritula, A. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Sharpan, O. B.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2012-11-07
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/115
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The facilities of multilevel discrete wavelet transform of pulse wave biosignal are analysed to estimate the influence of testing factors on the human functional state. It is ascertained, that the nature of wavelet coefficient of a pulse wave biosignal and the value of their mean-square deviation makes possible for us to assess qualitatively and quantitatively influence of a definite testing factor to the functional state of a person and to identify general and personal tendency changes for particular person. It is perspective for the diagnostic of the personal`s habits and for a prediction of a personal reaction to the external influence.
oai:ojs.radap.kpi.ua:article/132
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/132
2024-03-29T00:24:21Z
N
No. 47 (2011); 158-164
Research of a radiate ability of minerals is for the construction of microwave generators of the medical setting
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Movchanyuk, A. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Vinokurov, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/132
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At implementation of physical therapy procedures, advantage gets a simple and reliable medical apparatus. In a complete measure it belongs and to the apparatus for microwave therapy in the range of frequencies 37 – 78 GGc. At the same time the apparatus SHF of range differs complication of construction, high cost and insufficient reliability. To more simple and reliable devices of the medical setting it follows to take the thermal generators of SHF-range. One of basic lacks of similar medical generators there is small initial power. Authors are conduct experimental researches of materials of natural origin (minerals) for the working body of thermal generator, what would provide the increase of initial power these medical devices. The results of these researches is an exposure of materials in which a radiate ability in 4 times is greater from usually in-use – feroapoksidu.
oai:ojs.radap.kpi.ua:article/133
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/133
2024-03-29T00:24:21Z
N
No. 47 (2011); 165-175
Algorithm for solving the Electrical Impedance Tomography forward problem by the modification method
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/133
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Algorithm for solving the Electrical Impedance Tomography forward problem by the modification method with “conductivity zones”, which are generated using square finite elements, is proposed. The number of zones is equal to the number of electrodes on the phantom outline (for example, 14 with 16 electrodes, two of which are intended for connection of the independence current source). The proposed algorithm economy, that is a consequence of internal zones nodes reduction, is shown The examples of continuos phantom discretization to conductivity zones, that consist of square finite elements are given. The examples of equal voltage lines distribution inside the phantom with different (in size, surface conductivity) inhomogeneities and with different number of those inhomogeneities are shown. These examples illustrate the possibilities of algorithm for solving the Electrical Impedance Tomography forward problem and also the inexpediency of back projection method using (in general case) for solving the inverse problem.
oai:ojs.radap.kpi.ua:article/156
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/156
2024-03-29T00:24:21Z
N
No. 48 (2012); 168-178
Assessing the level of cavitation methods impedance tomography
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Movchanyuk, A. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/156
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In article is offered the technique of an estimation of presence and development degree cavitations to a liquid in pipes methods of an impedance tomography. For technique realization are used methods of reconstruction of an image with use of a method of final elements and a method of "zones" of conductivity on electric model of the phantom (tomography slice) in the form of squares of resistance with two diagonals and the "zones" consisting of these squares. Presence of the integrated zones provides radical reduction of usages of systems in systems of the equations of iterative procedure of Newton-Rafsona (at number increase reconstruction phantoms). Resolution of a method of reconstruction remains same, as well as for classic a method of final elements. The problem of conditionality of a matrix derivative of transfer resistance on surface conductivity of the phantom is thus eliminated. The choice of the form of "zones" of conductivity defines accuracy of reconstruction at a various arrangement of heterogeneity in the phantom.
oai:ojs.radap.kpi.ua:article/158
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/158
2024-03-29T00:24:21Z
N
No. 48 (2012); 179-185
The method of phase plane as a way to survey the state of the cardiovascular system based on pulse wave analysis
Nikitchuk, T. N.; Zhytomyr State Technological University, Zhytomyr
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/158
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In the paper the method of phase plane, based on the analysis of biosignals two-dimensional phase environment, and its application to study pulse wave. The possibility of construction of phase portraits of the pulse wave method isocline. Diagnostic value of such studies due to the fact that the various lesions of the cardiovascular system is changing not only the signal but also its time derivative. The proposed method to improve and best practices databases in different situations and effects on the cardiovascular system will compare the phase portraits pulsohram and identify diagnostic indicators to establish the current functional state of man without lengthy clinical trials and invasive interventions.
oai:ojs.radap.kpi.ua:article/212
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/212
2024-03-29T00:24:21Z
N
No. 45 (2011); 170-176
Electronically methods and facilities of lungs auscultation
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Romanuk, V. P.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/212
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Disadvantage of the traditional means of pulmonology are considered. Electroacoustic and biomechanical ways of registration breath sounds on chest surface are analyzed. The block diagram of the switch-modulation device for auscultation human bronchopulmonary systems is developed. We consider the transformation algorithm and compare the measuring and reference sounds of the human body. The results of the analysis of differences between the signals are displayed on the display or an external imaging system.
oai:ojs.radap.kpi.ua:article/213
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/213
2024-03-29T00:24:21Z
N
No. 45 (2011); 176-184
Driver's condition control devices
Yashan, V. B.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/213
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The article describes the various types of biotechnical systems of transport security, that often called by general title "Antison. Their main disadvantage is the uncertainty of detecting drowsiness phase of driver’s state and the absence of biological feedbacks, that providing control of functional parameters of a human-driver in a mode of adaptation. Structurally, these systems are complicated by the presence of contact with the driver of sensors that restrict the freedom of his movements. There is described experiment, which was carried out in Greece in 2008, and where tested different types of systems which include motion sensors, EEG monitoring for the eyes, the recognition of road markings, control automotive electrical system. The results showed the feasibility of using sleep prevent devices.
oai:ojs.radap.kpi.ua:article/227
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/227
2024-03-29T00:24:21Z
N
No. 43 (2010); 72-82
Microwave radiometry in biology and medicine: the structural solutions opportunities and prospects
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/227
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Consider the original technical solutions radiometric instrumentation for biomedical applications, as well as options for its use.
oai:ojs.radap.kpi.ua:article/228
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/228
2024-03-29T00:24:21Z
N
No. 51 (2012); 115-121
Comparative analysis of promising current sources for electrical impedance tomography in an extended frequency range
Timoshenko, G. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2012-12-05
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/228
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Iintroduction: Features of biological impedance meters are listed and requirements for their current sources are formed. Formulation of the problem: A review of existing current sources and puts forward proposals to explore the parameters of some of them and the current source on a fully integrated differential amplifier with active feedback. Methods of research and analysis of the results: Describes the method of measuring the parameters of current sources, critically reviewed the results and recommendations for the use of these sources. Conclusion: The accomplishments and weaknesses of the investigated sources, given ways to improve their parameters are considered.
oai:ojs.radap.kpi.ua:article/237
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/237
2024-03-29T00:24:21Z
N
No. 50 (2012); 92-104
Electrical Impedance Tomography potential sensitivity
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yakubenko, A. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/237
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The analysis of EIT phantom outline voltage measuring accuracy is carried out in this article. This accuracy is necessary for exposure of single inhomogeneity presence: "small" (it’s square is equal 3% of global phantom square), "middle" (8,5%) and “big” (19,59%) with different surface conductivity values of these inhomogeneities (background is phantom with surface conductivity σ=1). Measuring was imitated by homogeneous phantom and phantoms with inhomogeneities voltage calculating and voltage difference computing (increment) between homogeneous phantom and phantoms with inhomogeneities. Inhomogeneities with bigger surface conductivity value than background conductivity value give significantly less voltage increments than inhomogeneities with smaller surface conductivity value than background. More sensitivity with closer position to phantom outline and bigger inhomogeneities size is illustrated by means of numerous increments values. Necessary measuring accuracy numerical assessments are proposed for considered inhomogeneities.
oai:ojs.radap.kpi.ua:article/240
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/240
2024-03-29T00:24:21Z
N
No. 52 (2013); 120-128
Choice of the study object for mathematical model in Electrical Impedance Tomography
Gorb, M. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Guseva, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2013-05-04
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/240
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Introduction. A brief review of scientific publications relating to questions of the object for study modeling that implements the EIT methods is given. Formulation of the problem. EIT features associated with three-dimensionality of processes taking place in the study objects during the measurement and the complexity of the reconstruction process are shown. A comparative analysis of the quasi-static and full-wave model of the object for study is presented. Conclusion. Based on three-dimensional processes that take place in the study objects using EIT has shown that adequate models of study objects should be based on quasi-static or full-wave electrodynamics approaches.
oai:ojs.radap.kpi.ua:article/390
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/390
2024-03-29T00:24:21Z
N
No. 34 (2007); 130-133
Electrostatic model applicators for hypothermia
Goloschapov, A. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/390
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The structural feature of applicators is examined for hyperthermia that possibility of calculation of the electromagnetic fields and division of temperature in біотканинах at treatment of hyperplasia of peredmikhurovoy gland.
oai:ojs.radap.kpi.ua:article/391
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/391
2024-03-29T00:24:21Z
N
No. 34 (2007); 133-136
The analysis of ways of struggle against artefacts at registration pulse waves a method photoplethysmography
Mosiychuk, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/391
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Examines a noise stability a method photoplethysmography. Is surveyed, ways of struggle against artefacts of a mechanical and optical parentage are offered.
oai:ojs.radap.kpi.ua:article/392
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/392
2024-03-29T00:24:21Z
N
No. 34 (2007); 137-141
Microwave applicator for hyperthermia on the basis of spiral periodic structure
Sergienko, A. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Naidenko, V. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/392
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The use of periodic structures for creation of applicators with the homogeneous or near to him distributing of the electromagnetic field is offered. The given results of modeling of the offered structure and the numerical accounts show prospects of such applicators.
oai:ojs.radap.kpi.ua:article/393
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/393
2024-03-29T00:24:21Z
N
No. 34 (2007); 142-149
Research of electrophysics and electromagnetic biologics activity point parameters of person organism
Pustova, S. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/393
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Results of researches of electrophysics and electromagnetic biologics activity point parameters of person organism are bring; coupling these parameters are estimated.
oai:ojs.radap.kpi.ua:article/451
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/451
2024-03-29T00:24:21Z
N
No. 51 (2012); 106-114
Features of solving the Electrical Impedance Tomography inverse problem by zones conductivities method
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2013-01-29
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/451
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The comparison of the iterative process convergence for the EIT inverse problem solving by classical Newton-Raphson method, regularization method by A. Tyhonov and asymmetric current source connection to zones phantom is carried out. Ill-conditionality of the derivatives matrix is shown. It leads to very big errors. The regularization method by A. Tyhonov gives satisfactory results at any position of zones phantom relatively current source connection. Chosen methods for the inverse problem are programmed easy and are convenient in practice, because of their usage with zones conductivities method.
oai:ojs.radap.kpi.ua:article/465
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/465
2024-03-29T00:24:21Z
N
No. 33 (2006); 129-135
The mathematic model of process of the interconnection of the laser radiation with the biologics objects
Zinkovskiy, Yu. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Bogomolov, M. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/465
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The method of the mathematic analysis of the second laser radiation, which interconnection with blood elements, are purposed
oai:ojs.radap.kpi.ua:article/467
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/467
2024-03-29T00:24:21Z
N
No. 33 (2006); 136-141
Analysis of character of dependence between pulse pressure in an artery and amplitude of a pulse signal non invasive registered
Sharpan, O. B.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Mitrov, A. P.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/467
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Dependences of amplitude of a pulse signal registered by a non-invasive method from pulse pressure in an artery are studied. It is shown, that for ranges of the pressures concerning to people, with an adequate accuracy it is possible to consider this dependence the linear
oai:ojs.radap.kpi.ua:article/470
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/470
2024-03-29T00:24:21Z
N
No. 33 (2006); 141-146
Radiometers measurements electromagnetic fields of the poorly concentrated solutions of salt, sugar
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Kirpich, J. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Peregudov, S. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/470
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In the article results of research extraordinarily of low power radiations of the poorly concentrated solutions of salt, sugar, and also other physical and biological objectives at mm-range of wavelength
oai:ojs.radap.kpi.ua:article/535
2024-03-29T00:24:21Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/535
2024-03-29T00:24:21Z
N
No. 52 (2013); 111-119
Rheogram analyse by phase plane method
Manoylov, V. P.; Zhytomyr State Technological University, Zhytomyr
Mosiychuk, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Muzhitska, N. V.; Zhytomyr State Technological University, Zhytomyr
Nikitchuk, T. N.; Zhytomyr State Technological University, Zhytomyr
Timchyk, G. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/535
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Rheography or impedance plethysmography is a non-invasive medical method of electrical resistance measurements that reflects blood volume changes of a tissue. Rheogram signals are usually processed by the form analyze where quantity assessment based on characteristic point. But rheography signal might be so specific in the case of some disease that this method is not possible to use. Therefore we research possibility of using phase plane method for rheogram analyze for mor e accurate diagnose. We have registered signals from four group of patient: healthy, with vascular dystonia, neurocirculatory dystonia and hypertension pathology. Different types of signal preprocessing in particular filtration with soft threshold are comp ared to accept appropriate result from applying phase plane method. The most appropriate result is achieved by applying discrete wavelet transform with coefficient based on Hirst ratio. Diagnostic value of rheograms analysis by their phase portraits is proved. Especially, it is possible to recognize norm and pathology by two quantitative measures of phase portrait: diameter and square.
oai:ojs.radap.kpi.ua:article/571
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/571
2024-03-29T00:24:22Z
N
No. 37 (2008); 106-109
Microwave generators on deducted flows of electromagnetic radiation for medical and biological applications
Peregudov, S. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Bidenko, V. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Panasjuk, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/571
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The new type of the microwave medical equipment based on formation of deducted flows of electromagnetic radiation is considered. The opportunity of increase стабильносты of parameters of the generator is shown at the expense of introduction of the circuits термостатирования and indication of target capacity.
oai:ojs.radap.kpi.ua:article/627
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/627
2024-03-29T00:24:22Z
N
No. 42 (2010); 136-138
Mathematical design of processes of dispersion of radiation from biological objects
Kyrychenko, V. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Bogomolov, M. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/627
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Тhere are the considered methods of blood and her component elements test - red corpuscles. Development of mathematical model of processes of dispersion of laser radiation from биобъектов on теориеи Ми. Information is got from the type of changes of red corpuscles reason of which there is a pathosis, enables to conduct express-diagnostics and define widespread diseases.
oai:ojs.radap.kpi.ua:article/635
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/635
2024-03-29T00:24:22Z
N
No. 42 (2010); 139-144
Hardware implementation and diagnostic features of gas discharge visualization method.
Kuhtin, V. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Petelskyi, P. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Chepurnyi, Ju. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/635
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Hardware implementation variant of GDV-device was considered and Kirlian-images, taken by the instrumentality of developed device, were shown.
oai:ojs.radap.kpi.ua:article/638
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/638
2024-03-29T00:24:22Z
N
No. 42 (2010); 144-151
Increasing the reliability uninvasion analysis macronutrients in blood by digital processing of the ECG
Yakovenko, I. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Klochko, T. R.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Pelykh, A. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Leus, E. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/638
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Treatment of these EKG is in-process examined by means of method of decomposition on the empiric fashions of Huang. Distinguishing feature consists of that the base functions of decomposition are determined adaptive on the basis of the processed data. Decomposition of signal is in-process conducted EKG on empiric fashions. By means of this decomposition filtration of signal was con-ducted from high-frequency noise and LF drift.
oai:ojs.radap.kpi.ua:article/645
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/645
2024-03-29T00:24:22Z
N
No. 53 (2013); 104-110
Research of cells substances biosensor reaction on radiation pulse gas-discharge generator for information-wave therapy
Oliynyk, V. P.; National Aerospace University named after M. Ye. Zhukovskiy “Kharkiv Aviation Institute”, Kharkiv
Kulich, S. M.; National Aerospace University named after M. Ye. Zhukovskiy “Kharkiv Aviation Institute”, Kharkiv
Stepanova, K. O.; National University of Pharmacy, Kharkiv
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/645
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Introduction. The biological effects are characterized by a range of millimeter waves in the spectrum of electromagnetic radiation of high frequency. This is due to the fact that the membranes of living cells with dipole oscillate in the millimeter frequency range. The aim. The aim is cell structures using as biosensors of natural electromagnetic radiation in millimeter range with extremely low intensity for the energy and spectral characteristics evaluation of the discharge pulse generator for information-wave therapy. The experimental technique. The study was conducted «in vitro». The suspension of bone marrow cells of rats in saline was the object of irradiation. One of the cell suspensions was seen, as a control and the other three parts were subjected to irradiation of 10, 20 and 30 minutes. The relative number of dead cells was determined in the control sample and the sample irradiated at 30, 60 and 90 minutes as the characteristics of biosensor response. Results of the study. The relative number of dead cells in the irradiated sample is almost twice lower than for the control for all three exposures. Thus, the impact generated electro-magnetic radiation enhances the viability of bone marrow cells of rats. Conclusions. The experiments indirectly support the structure of the frequency spectrum of electromagnetic radiation discharge pulse generator. Also the theoretical possibility of biosensors constructing based on cell structures can be mentioned for registration superweak radiation in millimeter range.
oai:ojs.radap.kpi.ua:article/649
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/649
2024-03-29T00:24:22Z
N
No. 53 (2013); 111-118
Enhancement of the low-intensity noise generator efficiency
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Peregudov, S. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Vinokurov, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/649
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Introduction. The low-intensity noise generators of millimeter wavelength range find wide application in the engineering, biological appliance and therapy procedures due to the simplicity, reliability and efficiency at treatment of pain syndromes in the different branches of practical medicine. Design of the low-intensity noise generator. The features of low-intensity noise generator are electromagnetic waves generation by means of the radiation source (working substance) that has a temperature more or less of the environment ambient temperature. Structurally the radiation source is made as a millimeter range waveguide matched load. It is enclosed and heat-insulated. One of basic lacks of similar noise generators is small initial power. Authors have proposed two variant of the noise generator power increasing. Their experimental stud-ies results and choice of natural origin (minerals) materials prompt are undertaken for the working substance of thermal generator and more effective construction of cool element of-fers. Enhancement of the noise generator power. Utilization of mineral (for example, nephrite) as working substance provides the double increase of noise initial signal power in comparison with standard material – ferroepoxide usually used in microwave technique. The multi-layered construction of Peltier element provides the value of working substance temperature in range 20-30оС accordingly increases power of negative electromagnetic stream. Conclusion. Thus the proposed low-intensity noise generator design provides greater efficiency at its use in the engineering, biological appliance and therapy procedures of practical medicine.
oai:ojs.radap.kpi.ua:article/650
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/650
2024-03-29T00:24:22Z
N
No. 53 (2013); 119-125
Single-channel power meter for registration of human millimeter radiation
Savenko, Ya. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Sychov, O. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/650
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Introduction. The development of modern techniques for noninvasive diagnostic sets requirements to ensure complete diagnostic safety, efficiency, comprehensiveness while maintaining high reliability of quantitative results. One of the promising directions for creating such devices is based on the idea of using information properties of the extra low millimeter-wave radiation from the human body or other biological objects. Problem definition. The main difficulty in registration of such radiation is associated with exceptionally low power electromagnetic field generated by the body and the absence lack of opportunities for effective their reception by the radiation sensitive receivers. This is a significant issue of physical media relevant information signals that ensure effective processes in the body. Solutions to the problem. The absence of a necessary equipment for electromagnetic radiation registration of millimeter range extra low radiation until now makes impossible the diagnostics in this range. Power meter based on semiconductor sensors can improve the compactness of equipment, ease of use and efficiency in diagnostics. Description of the model and experiment. The receiver located on the surface of the skin can get a signal from the cell body. The information status of cells in the deeper layers of the body is transferred to the surface of cells and is a modulating factor for the generated millimeter radiation. Three basic hardware portions that make up its technical support should be included in the diagnostic system. There are antenna measuring unit and interface process unit, storage and presentation of information. These signals can be detected and processed by a computer. The range of information signals estimated spectral characteristics of low-frequency envelope of the received signal can be used as informative features. Application. Any disease of the body changes metabolic processes in cells, thereby initiating the process of functional reorganization and related variations in their radiation spectra of electromagnetic waves. Spectra electromagnetic waves in all possible frequency range will vary depending on the functional state of the controlled object. This pathologically altered cells, tissues or organs will produce disharmonious electromagnetic waves. Conclusions. The functioning of healthy cells is accompanied oscillated fluctuations in the plasma membrane. Registration of these oscillations and their analysis reveals changes in disturbance in the functioning of the organism to asymptomatic stage of the disease. Millimeter waves generated by biological objects give the task of designing a multichannel radiation receiver with the level of self noise as lower as possible and high sensitivity.
oai:ojs.radap.kpi.ua:article/651
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/651
2024-03-29T00:24:22Z
N
No. 42 (2010); 152-156
The use of non-reciprocal passive devices in the EHF-therapy
Burim, O. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Vuntesmeri, Vol. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
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Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/651
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Сonsidered the basic scheme of construction equipment for EHF-therapy. There are an investigation of the influence of the inconsistency of antenna on the level of absorption power by the patient. Shown that the use of passive nonreciprocal devices reduces the dependence of the absorption of therapeutic doses antenna's inconsistency.
oai:ojs.radap.kpi.ua:article/676
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/676
2024-03-29T00:24:22Z
N
No. 54 (2013); 144-150
Using the three-frequency bioimpedance measurement for inhomogeneous biological objects
Timoshenko, G. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2013-11-07
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/676
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Introduction. The possibility of using three-frequency bioimpedance to determine the structure of a biological object with two inhomogeneities are investigated. Formulation of the problem. The veracity of the determination the internal structure of inhomogeneous biological objects using three-frequency bioimpedance measuring method are studied insufficiently. Methods of research and analysis of the results. Describes the method of determining the possibility of using the three-frequency bioimpedance measuring method for determination the internal structure of inhomogeneous biological objects. Conclusion. Studies indicate the usefulness of three-frequency bioimpedance measuring method just for a rough determination of the parameters of the biological object.
oai:ojs.radap.kpi.ua:article/677
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/677
2024-03-29T00:24:22Z
N
No. 55 (2013); 107-117
The sensitivity in Electrical Impedance Tomography
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gamanenko, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2013-12-17
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
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Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/677
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Introduction. The concept of sensitivity in Electrical Impedance Tomography is introduced (first – fourth type). The experimental researches measuring the voltages on the phantom outline are conducted on the created layout (for uniform cylindrical vessel with brine and placed inhomogeneities in a vessel). The main part. The inverse problems are solved for simulated on PC phantom (the third type sensitivity) and from measured results (the fourth type sensitivity) by conductivity zones method using regularization by A. Tykhonov. The sensitivity to conductivity increasing of elements inside the phantom is significantly less than the sensitivity to resistance increasing. The results of measured voltages processing and the results of projection reconstruction (obtained from mathematical model and from measured results) are described. Conclusions. The satisfactory agreements of reconstruction results between themselves and with mathematical and measured phantoms are shown.
oai:ojs.radap.kpi.ua:article/703
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/703
2024-03-29T00:24:22Z
N
No. 55 (2013); 118-127
Selecting the number of frequencies for real time electroimpedancemetry of biological objects
Timoshenko, G. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2013-12-17
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/703
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Introduction. Determining the sufficient number of frequencies for biological object impedance measuring is being researched. The presence of one or two object granularities is considered. Formulation of the problem. Often impedance measuring is conducted in a real time conditions. The number of frequencies directly influences measuring time. Existing studies of frequencies quantity were based on a coarse Krike and Morse impedance model. Research methods and the results analysis. This work offers method for calculating the sufficient number of impedance measuring freqencies for biological object, which contains one or two granularities. Conclusions. Sufficient number of frequencies for the object containing one or two granularities was evaluated. Also path for discovering the case three and more granularities was prompted.
oai:ojs.radap.kpi.ua:article/731
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/731
2024-03-29T00:24:22Z
N
No. 36 (2008); 104-107
Classification of the state of the vascular system on graph element of the pulse wave
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Nizhebetska, Y. Kh.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Plyatsko, N. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2008-05-26
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/731
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The algorithm of classification is offered and creation of classificatory is illustrated for three classes of pulse diagram.
oai:ojs.radap.kpi.ua:article/732
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/732
2024-03-29T00:24:22Z
N
No. 36 (2008); 108-113
Features and use of the terahertz waves in biology and medicine
Melnik, E. T.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2008-05-26
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/732
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The biological effects of the terahertz waves and ways their use in biology and medicine are considered
oai:ojs.radap.kpi.ua:article/733
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/733
2024-03-29T00:24:22Z
N
No. 36 (2008); 113-119
Research of resisting of the biological active point for constant and alternative current
Peregudov, S. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Pustova, S. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2008-05-26
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/733
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Is conducted research of resistance of biologically active point (BAT) on a direct and variable current. Research results are presented. The estimation of intercommunication between resistance of skin and by an electromagnetic radiation in BAT is done. Is shown possibility of the use of experimental information for diagnostics of the state of human to the organism.
oai:ojs.radap.kpi.ua:article/735
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/735
2024-03-29T00:24:22Z
N
No. 36 (2008); 119-122
Experimental research of digital photoplethysmography sensor’s performances
Mosiychuk, V. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Sharpan, O. B.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2008-05-26
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/735
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Design of. the new, high-sensitivity optica! sensor, on the basis of the light-emitting diodes is presented, one with which carries out function of a light source, and another back displaced functions as the detector. Availability this principle of measuring for problems of recording pulse waves is shown.
oai:ojs.radap.kpi.ua:article/756
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/756
2024-03-29T00:24:22Z
N
No. 56 (2014); 152-164
Sensitivity of phantom contour voltage to complex impedance changes of inhomogeneities in Electrical Impedance Tomography
Dostal, T.; Brno University of Technology, Brno
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Matsai, A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Gaydayenko, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2014-04-03
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/756
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Introduction. The analysis of surface conductivity influence of inhomogeneities to the changes of complex phantom contour voltages comparing with a homogeneous phantom with complex surface conductivity is carried out. The analysis of the influence of finite element and all phantom generally anisotropy on the calculated complex voltages is conducted. The results. The model of square finite element is obtained. It consists of 1024х1024 finite elements obtained by simplified approximate formulas. The relative increments of voltage values are unchanged regardless of the difference in the absolute values of voltages measured at different positions of the current source. It is proposed to rotate the phantom grids of finite elements and conductivity zones with the current source rotation to overcome this anisotropy. Conclusions. Final conclusions about the limits of the measuring device sensitivity could be done only after the data accumulation of solving the inverse problem by zones conductivity method.
oai:ojs.radap.kpi.ua:article/826
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/826
2024-03-29T00:24:22Z
N
No. 59 (2014); 130-137
Wireless distributed information-computational system for ophthalmic research
Pantasenko, V. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Iashchuk, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Pavlov, O. I.; International Research and Training Center for Information Technologies and Systems of the National Academy of Sciences (NAS) of Ukraine and Ministry of Education and Science (MES) of Ukraine, Kyiv
2014-11-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/826
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Introduction. The problem of creating a distributed measurement system designed to simplify the analysis of the organs of vision. Proposed the concept creating own flexible measuring system and management software for it. Main part. In this work we analyzed the problem of implementing a wireless distributed information-computational system for ophthalmic research using modern technical devices. Described to functional distributed data-processing system developed and its components. Shown the main characteristics of the developed software by which can control the system input and output information by operator, organizing communication between systems parts and automated information storage in the database After analyzing the characteristics of the system put forward its advantages over analog. Conclusions. It is shown that there is possible to create a measurement system for ophthalmologists using mobile handheld devices, wireless communication systems and a personal computer.
oai:ojs.radap.kpi.ua:article/837
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/837
2024-03-29T00:24:22Z
N
No. 59 (2014); 111-120
The assesment of sensitivity in Electrical Impedance Tomography by normal transformation method
Sushko, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Rybin, A. I.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Chekerys, I. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2014-12-25
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/837
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Introduction. The classifier creation on the base of discrete normal orthogonal transformation to access the advisability of inverse Electrical Impedance Tomography (EIT) solving is proposed. Measured voltages on electrodes on the phantom outline are output data for EIT inverse problem solution. The necessity in preliminary assessment exists because the process of solving is labor-intensive and may not have the reliable results. The results. The sensitivity access classifier is developed. It allows to make a conclusion about potential possibility of reliable reconstruction result obtaining from calculating the transformant coefficients of measured voltages sets. The transformant coefficients are calculated in cases of reliable visualization results obtaining and in cases where the results of computer simulation phantom voltages and their measurements obtaining the reliable reconstruction of resistance distribution is not possible. The calculations are conducted for different inhomogeneities, with different values of conductivity and locations. Conclusions. The results suggest the possibility of creation the classifier for sensitivity access. The appropriate database of reliable and unreliable solutions should be formed in the process of reconstruction problem solving.
oai:ojs.radap.kpi.ua:article/938
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/938
2024-03-29T00:24:22Z
N
No. 59 (2014); 121-129
Application of eigenfunction expansion method to the microwave tomography
Gorb, M. S.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Guseva, E. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2014-12-25
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/938
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Introduction. Literature review and description of the microwave imaging is presented. Underlined advantages, application, description of experimental setups, and methods for solving forward and inverse problem. Methods. Described an algorithm for solving the problem of microwave tomography using eigenfunction expansion method. Object of research is shielded (to limit the area of calculation and avoid accounting radiation waves of the continuous spectrum) transversely inhomogeneous object, with the possibility of further complications to the longitudinally inhomogeneous object. Proposed to apply eigenfunction expansion method for solving forward problem of microwave imaging. Expected results. Improving accuracy of calculation longitudinally homogeneous object, compared with the two-dimensional problem, numerically effective calculation of the three-dimensional objects (transversely and longitudinally inhomogeneous) in comparison with other numerical methods.
oai:ojs.radap.kpi.ua:article/948
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/948
2024-03-29T00:24:22Z
N
No. 46 (2011); 176-185
Basic algorithm of treatment EKG for the increase of authenticity of determination of macronutrients in blood
Yakovenko, I. A.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Klochko, T. R.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Leus, E. A.; Natsionalna dytiacha spetsializovana likarnia “OKhMATDYT”
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/948
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In the article new approaches over of perfection of algorithm of treatment ЭКГ are brought for the increase of authenticity of determination of macronutrients in blood. Treatment of these EKG is in-process examined by means of method of decomposition on the empiric fashions of Huang, that allows to analyses and process the nonlinear and non-stationary systems. His distinguishing feature consists of that, that the base functions of decomposition are determined adaptive on the basis of the processed data. Also in this article approaches over of renewal of standard trajectories EKG are brought by means of the signal shaping in a complex plane, that promotes quality of output and treatment of electrocardiograms considerably. It is offered authors in future, for the estimation of standard fragment of EKG to use the methods of processing of images, in particular to apply the contour concerted filtration.
oai:ojs.radap.kpi.ua:article/951
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/951
2024-03-29T00:24:22Z
N
No. 59 (2014); 103-110
Eguipment and technologies of low intensity millimeter therapy
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Peregudov, S. N.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Fedotova, I. V.; Center of Family Medicine "Adonis-О", Kyiv
Golovchanska, O. D.; National O.Bogomolets medical university, Kyiv
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/951
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Introduction. Mastering the millimeter range of wavelengths has led to apperence of different types devices and their usage in many fields of science and technology, including the practical medicine. As shown by numerous clinical studies, persistent therapeutic effect in the treatment of different diseases by electromagnetic noise signals observed even at levels of intensity 10-12-10 10 W / Hz/sm2 that is comparable to energy of individual quanta of mm-range of electromagnetic radiation. Thus this area of medicine is known as a quantum medicine, which is a practical realization of the fundamental direction of "Physics of the Alive" launched Ukrainian scientist Professor S. Sitko. Main body. Leading technologies of Quantum Medicine are microwave resonance therapy and Sit’ko-microwave resonance therapy. Results of clinical studies have proven the feasibility of quantum medicine technologies using noise generators "Porig-3", "Porig-3M", "Porig-HT", developed with the participation of authors and monochromatic generators "Aria-SC" and "AMRT 02" – development of Kharkiv scientists. Devices can be used as individually and together, for example, in Sitko-medecine technology. Guidelines and approaches of MRT using for treatment of pathological processes virtually all organs and systems of the human body: endocrine, bronchopulmonary and cardiovascular, digestive, reproductive, urinary, support – skeletal system lesions of traumatic and other origin – are developed currently. It was established that the use of MRT improves the immune and cardiovascular systems, both directly and indirectly, through neurohumoral regulation and restoration of homeostasis of the organism. Conclusions. Thus, quantum medicine that is based on the effects of low-intensity millimeter wave signals are promising direction of applied medicine with the appropriate hardware can be used to treat a wide range of diseases of the human body.
oai:ojs.radap.kpi.ua:article/989
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/989
2024-03-29T00:24:22Z
N
No. 60 (2015); 114-121
Peculiarities of lowintensity microwave radiation of materials for physiotherapy
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Yavorskyy, B. I.; Ternopil Ivan Puluj National Technical University, Ternopil
Tkachuk, R. A.; Ternopil Ivan Puluj National Technical University, Ternopil
Rusinchuk, V. P.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2015-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/989
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Introduction. The results of low-intensity EMI of natural materials studies used for thermal physiotherapy are reviewed. Research results. In a result of radiometric measurements of weak signals at frequency of 45 GHz and therapeutic temperatures of (35-50)°C the quantitative assessment of the power level of these signals remain limited in diapason of (10-12 - 10-13) W‧cm-2. It was detected that in addition to thermal (i.e. infrared) positive flow using the mineral wax and mud were molded the micro components of negative type. This fact explains the additional therapeutic influence at painful inflammatory processes, which are characterized that is increased temperature. Conclusions. It was found that the wax has a low emissivity and that by the ratio of the main component of the therapeutic mixture it is possible to control the level of negative microwave component.
oai:ojs.radap.kpi.ua:article/1005
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1005
2024-03-29T00:24:22Z
N
No. 60 (2015); 122-130
Complex of computer models for cold stress evaluation in water
Ermakova, І. I.; International Research and Training Center for Information Technologies and Systems of the National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Kiev
Ivanushkina, N. G.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Nikolaenko, A. Yu.; International Research and Training Center for Information Technologies and Systems of the National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Kiev
Solopchuk, Yu. N.; International Research and Training Center for Information Technologies and Systems of the National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, Kiev
2015-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1005
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Introduction. Due to the high value of water thermal conductivity comparing to air, stay of man in cold water (water temperature lower than 25 sup>°C) is associated with high life and health hazard. One of the ways to evaluate survival time of human in water is usage of statistics data about survivors and water temperature organized as tables and curves. Another method to evaluate survival time and physiological state of man in water is computer modelling of human thermoregulatory system. Computer modelling allows to predict human thermal state in extreme environment without health hazard for man. Main body. Information technology based on complex of mathematical models was developed to predict human thermophysiological state in cold water. The main component of complex is mathematical model of shivering in muscles. Shivering increases heat production up to four-fivefold of basal metabolic rate. Human thermophysiological state in case of accidental water immersion at temperature range from 5 to 25 °C was predicted using information technology. In order to evaluate influence of immersion level on hypothermia, computer modelling was performed for cases of full immersion, head out of water and immersion with head and arms out of water. Conclusions. Developed complex of computer models allows to predict human thermophysiological state and evaluate cold stress in wide range of water temperature and the immersion level. The modelling results showed that the cooling rate increases with reduction in water temperature and the increase in percentage of immersed human body. When water temperature below 25 °C heat loss is always higher than shivering in muscles, thus body core temperature reduces at all levels of immersion. The safest case of immersion is immersion with head and arms out of water.
oai:ojs.radap.kpi.ua:article/1051
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1051
2024-03-29T00:24:22Z
N
No. 61 (2015); 116-121
Apparatus and method remote contactless measurement of radiative heat flux
Shayko-Shaykovsky, A. G.; Yuriy Fedkovych Chemivtsi National University, Chemivtsi
Belov, M. E.; Yuriy Fedkovych Chemivtsi National University, Chemivtsi
Oleksyuk, I. S.; Bukovina State Medical University, Chernivtsi
Vasilov, V. V.; Chernovitsi Regional Hospital, Chernivtsi
Lennik, D. K.; Chernovitsi Regional Hospital, Chernivtsi
Shvab, N. N.; Chernovitsi Regional Hospital, Chernivtsi
2015-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1051
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Developed by the authors examined the equipment using the sensor on the anisotropic semiconductor crystals. The measurements are performed remotely, in a contactless manner to assess the radiative heat fluxes of biological and industrial objects in static and (or) dynamic modes, depending on the specifics of the object, the conditions of research and possible methods of measurement. The proposed method of measurement is only possible in the study of post-operative fields, infected and inflamed surfaces of the body of an organism. Temperature accuracy was 0,05° C. Developed a special computer program automatically processes the measured signals and identifies the information received with standard graphs corresponding to the normal functioning of the body parameters. The equipment can be used in stationary conditions, as well as outpatient, then cassette recorded information held decoding and identification in hospital environment, making use of the method and apparatus convenient and efficient.
oai:ojs.radap.kpi.ua:article/1054
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1054
2024-03-29T00:24:22Z
N
No. 61 (2015); 122-130
Block diagram of the improved continuous glucose monitoring system of human’s blood
Shcherbyna, D. A.; Ternopil Ivan Puluj National Technical University, Ternopil
Yavorska, E. B.; Ternopil Ivan Puluj National Technical University, Ternopil
2015-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1054
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Introduction. The glucose monitoring is an important issue diagnostic of diabetes. Based on analysis of the devices continuous glucose monitoring system Guardian REAL-Time selected for improvement. Research results. Designed flow diagram of the improved continuous glucose monitoring system Guardian Real-Time. Described the blocks and connections between them. Requirements regarding the components of pen-syringe. Conclusions. The resulting block scheme will improve the continuous monitoring glucose system in the blood Guardian Real-Time, such as automated calculation and enter the required amount of insulin, which in turn will significantly simplify insulin therapy. Also, the system will use people of all ages and people with visual impairments.
oai:ojs.radap.kpi.ua:article/1083
2024-03-29T00:24:22Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1083
2024-03-29T00:24:22Z
N
No. 61 (2015); 108-115
Problems of neurotoxicity assessment with using of electroretinography
Tkachuk, R. A.; Ternopil Ivan Puluj National Technical University, Ternopil
Yavorskyy, B. І.; Ternopil Ivan Puluj National Technical University, Ternopil
Yanenko, A. F.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2015-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1083
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Introduction. An actual problem of detection neurotoxication from getting nanoparticles into the human body in its initial stage, the identification of toxicant, determine its amount (dose) is considered. Formulation of the problem. The solving of the basic problems which encountered during improving electroretinography means and methods in its application to risk assessment person neurotoxication are considered in this article. Directions of retinographia improvement. We propose a method to improve of the standard electroretinography tools for assessment of risk of neurotoxicity. On the basis of the concept of applying with low intense pulsed light exposure on to the retina leads to a large resolution and less recovery time of the retina. A negative effect of reducing the intensity of the light obtained in the form of decrease of ratio energies of electroretino - signal to noise (ER-SNR). The application of the optimal Kalman filter to estimate the electroretinosignal in the selected from the retina its mixture with noise is based. The main results cited as simulation, and the field experiment. The statistical test of whether the alternative hypothesis achieves the predetermined significance level in order to be accepted in preference to the null hypothesis was applied. The formulas for entropy expressions in stationary and periodical correlated models of ERS are proposed. Conclusion. The results are used in development of an expert system for detecting of neurotoxicity, identification of nanoparticle type, and estimation of their dose in the nervous system of an organism, including at cases of a priori unknown particle.
oai:ojs.radap.kpi.ua:article/1159
2017-10-07T17:25:55Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1159
2017-10-07T17:25:55Z
N
No. 70 (2017); 43-48
Dynamics of frequency dependences of parameters of electric impedance of a person during dry fasting
Sharpan, O. B.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Mosiychuk, V. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2017-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1159
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Introduction The article considers the possibility of further development of the method of analysis of the parameters of electrical impedance to determine the current functional state of a person in various conditions of his life, in particular during the "dry" fasting. The aim of the study was the dispersion properties investigation of the amplitude and phase parameters of human body impedance in the extended frequency band during the weekly one and half day "dry" fasting. Methods. Measurement of electrical impedance parameters was performed weekly during half a year on one person before, during and after a day and a half fasting . Broadband three-frequency measurement technique is used. The possibility of analyzing the dispersion characteristics of a human body using the Cole hologram is considered. Results and discussion. It is established that in the process of "dry" fasting there is a change of all parameters of impedance. The most pronounced changes in the parameters of electrical impedance are observed by the definition of the module and the active component at a frequency of 100 kHz, the phase at frequencies 20 and 500 kHz, the reactive component at a frequency of 20 kHz. Conclusion. Changes in the dispersion properties of the human body impedance are noticeable in all parameters especially in phase and reactive resistance. According to the research results an interpretation of changes in the functional state of a person during fasting was made.
oai:ojs.radap.kpi.ua:article/1211
2016-06-30T18:50:03Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1211
2016-06-30T18:50:03Z
N
No. 65 (2016); 99-107
Automatic EEG eye movement artifacts removal using Independent Component Analysis
Kytsun, P. H.; LLC "Samsung Electronics Ukraine Company"
2016-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1211
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Background. Eye movement artifacts contained in EEG recordings hamper a lot the automatic processing and analysis of EEG signal. Therefore, the removal of such artifacts is important stage for any further signal processing. There are artifacts removal methods based on using wavelet transformation, regression analysis in the time and frequency domain, Principal component analysis and Independent component analysis. Methods. The novel method of automatic EEG eye movement artifacts removal based on Independent Component Analysis was proposed. The method utilizes the TDSEP algorithm for blind source separation. Own criteria for artifact components detection were used. The method was implemented with the Python programming language and tested on EEG signals recorded from two healthy volunteers. Results. Comparison of the effectiveness of the method was conducted with the participation of two experts. They were asked to review the EEG fragments before and after artifacts removal and evaluate the quality of artifacts removal. The average value of assessing the quality of artifacts removal was 4.83 for TDSEP based algorithm and 4.58 for FastICA based algorithm. Conclusion. The proposed method is more effective then method based on FastICA algorithm and using it for automatic EEG eye movement artifacts removal is expedient.
oai:ojs.radap.kpi.ua:article/1219
2016-10-12T19:34:56Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1219
2016-10-12T19:34:56Z
N
No. 66 (2016); 79-86
Criteria and Procedures for Estimating the Informativity and Feature Selection in Biomedical Signals for their Recognition
Shulyak, A. P.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Shachykov, A. D.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
2016-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1219
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Introduction. The issues of features informativity evaluation in biomedical signals portraits according to formal comparison of their probability values, obtained during training of supervised learning recognition systems are being considered. The purpose of this work is to increase the effectiveness of the biomedical signals recognition in diagnostic systems with supervised learning, by choosing rational structure of portraits based on the nature of their elements influence on the quality of pattern recognition.Details. Informativity values are used for feature selection in the formation of truncated portraits. Subsequent exclusion of less informative features from consideration relies in this paper in the basis of disclosure and implementation of reserves to increase the probability of correct recognition in diagnostic systems. Content and efficiency of the proposed signal processing technology is illustrated by the test case in the application to the common task of recognition of QRS-complexes types, useful for recognition system training with its data selection.Conclusions. The use of certain components of biomedical signals portraits, studied in the diagnosis of patients can have a positive impact on the quality of pattern recognition, while others create redundancy of portraits or reducing effectiveness of solving this task.
oai:ojs.radap.kpi.ua:article/1221
2016-07-01T17:18:09Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1221
2016-07-01T17:18:09Z
N
No. 65 (2016); 90-98
Wavelet analysis of the electrocardioignals for detection of the posttraumatic myocardial dystrophy features
Ivanushkina, N. G.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Ivan'ko, E. O.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Chesnokova, O. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Chaikovskii, I. A.; Glushkov Institute of Cybernetic of NAS of Ukraine
2016-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1221
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Introduction. The features of the traumatic disease's impact on the cardiovascular system are reviewed. Numerical experiments on electrocardiosignals of the soldiers injuried by mine explosion were held. The nature of the posttraumatic myocardial dystrophy is described. HR ECG signals' analysis. During clinical studies the registration and processing of electrocardiosignals were performed by the high resolution electrocardiography system. The time and amplitude analysis of HR ECG signals was held, and its low efficiency was approved. The integral parameters for detection of the posttraumatic myocardial dystrophy features based on the wavelet analysis of the electrocardiosignals are proposed. Conclusion. Since the myocardial dystrophy is caused by the violation of the processes related to the transport of ions Ca2+, the changes of electrocardiosignals are visible at the highest levels of wavelet decomposition. Thus, the 8th and 9th levels of the 9-level wavelet decomposition of averaged cardiocycles showed the best result for diagnostic.
oai:ojs.radap.kpi.ua:article/1232
2016-07-01T17:19:57Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1232
2016-07-01T17:19:57Z
N
No. 65 (2016); 108-118
Method of destruction of the pathological excitation sources in the heart by original monopolar electrode
Sychyk, M. M.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine, Kyiv Politechnic Institute
Stasiuk, Yu. P.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Savkina, M. V.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Sorochan, Ye. H.; National Technical University of Ukraine, Kyiv Politechnic Institute, Kiev
Maksymenko, V. B.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine, Kyiv Politechnic Institute
2016-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1232
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Purpose. This work is devoted to the study of destruction of the pathological excitation sources in the heart by the original monopolar electrode and the high-frequency electrosurgical generator Erbe VIO-100 S (Germany) in the coagulation mode in order to optimize technology of their using in surgical practice for Maze surgery. Methodology. Experimental study of the effect of electric current on the myocardium were performed in the laboratory on the endocardial part of four remote pig hearts in the cold hibernation state. Temperature evaluation of myocardial contact with the electrode was carried out using mathematical modeling of temperature fields of radio frequency current interaction with the tissue in the program Comsol Multiphysics. Results. Safe and effective destruction size, nature of histological and temperature changes in the interaction region of myocardial tissue with a source of electrical current depending on the duration and power application to stop the spread of pathological excitation sources in the heart were defined. Originality. The recommendations on the choice of the optimal parameters for the application of the generator Erbe and the original monopolar electrode were developed and adapted to radiofrequency ablation of myocardial tissue in the open heart for the arrhythmias treatment in order to reduce the total duration of surgery with cardiopulmonary bypass. Practical value. The results have been introduced in surgical practice of the State Institution «M. M. Amosov National Institute of Cardiovascular Surgery Ukraine NAMS of Ukraine». The work has great practical importance, because the expanding of the functional range of generator Erbe VIO-100 S (Germany) applications and reducing of the cost of radio frequency ablation procedure in comparison with the use of specialized disposable bipolar electrodes.
oai:ojs.radap.kpi.ua:article/1372
2017-03-30T01:11:40Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1372
2017-03-30T01:11:40Z
N
No. 68 (2017); 54-58
Comparison of epileptic seizure prediction performance for different EEG derivation schemes
Panichev, O. Yu.; National Technical University of Ukraine
"Igor Sikorsky Kyiv Polytechnic Institute"
Popov, A. O.; National Technical University of Ukraine
"Igor Sikorsky Kyiv Polytechnic Institute"
Kharytonov, V. I.; TMO "Psychiatry", Kyiv
2017-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1372
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Introduction. The influence of EEG derivation scheme on performance of epileptic seizure prediction is considered in the paper. Comparison of epileptic seizure prediction performance for different EEG derivation schemes is conducted. Database of EEG recordings from 20 patients (between 1 and 25 years old) suffering epilepsy was used. Correlation coefficients between channels of signal extracted with different combination of window and preictal lengths were used as features. Support vector machine was used to classify EEG data into interictal and preictal classes. Epileptic seizures prediction performance was evaluated using area under the ROC-curve for two types of derivation schemes: monopolar scheme with reference electrode on ipsilateral ear and scheme with averaged reference. Conclusions. It was found that there is a difference in epileptic seizures prediction performance for different schemes and patients. For subgroup of patients (9 of 20) usage of scheme with reference electrode in ipsilateral ear shows higher performance for window length between 2 and 10 seconds and in entire range of preictal lengths. Scheme with averaged reference shows higher performance when window length is in the range between 90 and 300 seconds.
oai:ojs.radap.kpi.ua:article/1384
2017-07-01T07:42:11Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1384
2017-07-01T07:42:11Z
N
No. 69 (2017); 62-65
Photometric Absorbance Spectrum Analyzer of Slightly Transparent Biomaterials
Yanenko, O. P.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Shevchenko, K. L.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Shulha, V. A.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Holovchanska, O. D.; Bogomolets National Medical University
2017-07-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1384
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Introduction. The measurement of optical radiation, especially the intensity of the light flux passing through biological tissues or other slightly transparent (cloudy) materials and the environments is a challenging problem due to the extensive development of new light sources of different wavelengths and their use in various fields of human activity. It is important to provide high sensitivity and accuracy measurement of the output parameters of light fluxes passing through the studied material - the depth of penetration, attenuation coefficient or absorption. The known methods and devices do not provide the required sensitivity and accuracy of measuring parameters. Main body. The aim of this study is to develop a photometric spectrum analyzer where along with the simplification of the scheme and increasing sensitivity and measurement accuracy the score of penetration depth of light flux into biological or other slightly transparent material, the determination of the attenuation coefficient and the spectrogram construction based on the analysis of two signals separated by wavelength light sources is ensured. One of the ways to increase the sensitivity and accuracy of the measurement devices is to use modulating method of the output signals transformation. Implementation of this method provides a significant reduction of the proper noises of the transformation signal path. Figure 1 shows a functional diagram of the developed by the authors device based on modulating transformation of the optical signal. It provides the measurement of the slightly transparent materials absorbance with increasing sensitivity and accuracy. Conclusions. Considered possibilities greatly simplify the measurement process. The use of the modulating transformation of the light flux provides increase in sensitivity in the measurement accuracy because such transformation compensates the intrinsic noise level and noise of the measurement channel. The semiconductor matrix is used as the light source. It provides accommodation of two crystals at one point of light diodes with the most spaced wavelengths allowing them to be placed on the same axis with photocell and excludes collateral scattering of the light flux.
oai:ojs.radap.kpi.ua:article/1396
2017-07-01T07:42:11Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1396
2017-07-01T07:42:11Z
N
No. 69 (2017); 66-71
Method for signal processing of biological trends based on wavelet analysis
Bodilovskyi, O. K.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Popov, A. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2017-07-01
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1396
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In this paper the approach for biomedical trends processing on signals of arterial blood saturation was proposed. This technique additionally could be applied to settle the problem of false alarms. Analysis based on dyadic wavelet transform was used for solving of this issue. Analysis of sensitivity and specifcity for modeled signals was performed. The signals contained patterns which could be interpreted as false alarms on 80, 85, 90, 95% SpO2. Experiment have given sensitivity 99% for 1-3 levels of decomposition and specifcity 30% for Haar wavelet.
oai:ojs.radap.kpi.ua:article/1397
2017-03-30T01:11:40Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1397
2017-03-30T01:11:40Z
N
No. 68 (2017); 59-63
Predicting of effectiveness of radiofrequency catheter ablation of arrhythmogenic zones in the heart on assessment of electrodes contact with myocardial tissue
Sychyk, M. M.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Kovshevatska, V. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Maksymenko, V. B.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Tarasova, L. D.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2017-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1397
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Purpose. This work is devoted to method developing for quantify assessment of the electrodes contact with myocardial tissue during catheter radiofrequency ablation. It will allow to perform forecasting destruction efficiency by visualizing them in three-dimensional internal surface of the heart in the color spectrum. Methodology. Original automated system is developed in the programming environment Matlab that can work with application of all types of catheters and digital map data of individual anatomy of the heart and destruction points derived from the electro-anatomical mapping system Ensite Velosity NavX (St. Jude medical, USA). The construction of three-dimensional model of the heart is performed and the radiofrequency destruction points are superimposed on it in a color spectrum corresponding to different distances electrode to myocardial tissue during ablation. Results and practical value. The assessing method of electrodes contact with myocardial tissue during catheter radiofrequency ablation is confirmed its accuracy and efficiency in clinical practice. It is introduced in State Institution "M.M. Amosov National Institute of Cardiovascular Surgery at NAMS of Ukraine" for control and predicting of tissue destruction effectiveness in the left atrium around pulmonary veins and isthmus between the veins and valves to block the spread of potential that lead to fibrillation and atrial flutter.
oai:ojs.radap.kpi.ua:article/1418
2017-10-07T16:52:17Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1418
2017-10-07T16:52:17Z
N
No. 70 (2017); 49-55
Two-part electrodes of the physical phantom for EIT
Hamanenko, O. I.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Guseva, E. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2017-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1418
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In this article explored methods for increasing of the accuracy of measurement in the hardware part of the electrical impedance tomograph, in particular, in its electrode system, which contains two-parts (combined) electrodes and are installed directly in a physical phantom. The principles of construction of the measuring part of the EITomograph using simple and combined electric drives are considered. Justified the choice of material for the producing of electrodes. Presented the construction of combined electrodes and the parameters of different materials for their producing. In the article describe the influence of non-identity for physical sizes of combined electrodes. Shown possible variants for the compensation of inaccuracy in the producing of electrodes and the inaccuracy of their installation. Increased ease of use and maintainability signal transmission lines by using these electrodes. Compared to simple electrodes, combined have several advantages: maintainability; rapid replacement of the electrode in a physical phantom (even in the presence of an electrolyte); manufacturability of producing; higher mechanical resistance and reliability; absolute decoupling of the measuring circle and power circle in the hardware part of the EITomograph; significantly lower amount of occurrence of artifacts during the image reconstruction. That's why application of combined electrodes leads not only to facilitate the physical construction and setting of the EITomograph. It also increases the quality of the solution of the inverse problem.
oai:ojs.radap.kpi.ua:article/1440
2017-12-30T13:14:12Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1440
2017-12-30T13:14:12Z
N
No. 71 (2017); 36-39
The use of optimal spatial filtering by the method of common spatial pattern for the classification of EEG signals according to the type of brain activity
Kytsun, P. H.; LLC "Samsung Electronics Ukraine Company"
2017-12-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1440
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During EEG due to the volume conduction the signal from each individual source appears simultaneously in a number of channels registered from different leads. Therefore, the recorded EEG signal gives a blurred picture of human brain activity, which makes the task of classifying such signals rather complicated. One of the effective methods to obtain an informative signal from the EEG record is to use the optimal spatial filtering (some kind of deblurring), when the maximum content of the signal from the particular region of the brain (which corresponds to a certain type of brain activity) is achived in the output signal. An algorithm for classifying EEG signals using optimal spatial filtering by the method of common spatial pattern is proposed to identify two classes of brain activity -- imaginary left and right hand movements. To evaluate the quality of the algorithm, an EEG record, known as BCI Competition IV dataset 2b, was used. To determine the efficacy of the algorithm, the result of its operation was compared with the result of the algorithm without using optimal spatial filtering. The use of optimal spatial filtering improved the accuracy of classification from 0.74 to 0.79, which has shown its efficacy.
oai:ojs.radap.kpi.ua:article/1446
2018-03-30T17:41:02Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1446
2018-03-30T17:41:02Z
N
No. 72 (2018); 42-46
Neural Network of the gestosis diagnosis system
Mustetsov, M. P.; V. N. Karazin Kharkiv National University
Bahan, S. O.; Kharkiv National University of Radio Electronics
2018-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1446
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Introduction. The work is devoted to the increase of the information content of the methods of express diagnostics of the state of the cardiovascular system of pregnant women by developing a diagnostic monitoring system and assessment of the state of hemodynamics of pregnant women due to the use of neural network technologies. Currently, gestosis is one of the most urgent problems of modern obstetrics due to the prevalence and complexity of etiopathogenesis, the absence of early and reliable diagnostic criteria, effective prevention and treatment measures, high maternal and perinatal morbidity and mortality, as well as large economic costs of intensive care for patients. The proposed approach to optimization of the diagnosis of preeclampsia using registration key hemodynamic parameters, which allows to objectively evaluate the hemodynamics in pregnant women with preeclampsia, to determine the type of hemodynamics in pregnant women and to monitor the effectiveness of the therapy. Neural network technologies for the analysis and processing of medical data. The synthetic structure of the artificial neural network has shown the effectiveness of its use for diagnosis of gestation, using real clinical data. The basis of the diagnostic system was the artificial neural network, using the application package Statistica. Hybrid network as an adaptive system of neuro-fuzzy output system. In order to diagnose gestosis, we synthesized a neural network that allowed us to classify the pathologies of pregnant women on the basis of oscillometric data, using neural-fuzzy modeling in the Matlab environment. In the framework of this work, the ANFIS editor was used to build the model that would help create or load a specific model of the adaptive neuro-fuzzy inference system, perform its training, visualize its structure, change and adjust its parameters, and use the configured network to obtain the results of fuzzy inference. The findings of the tests, show that with the introduction of 7 basic parameters characterizing the state of a pregnant woman, the produced result is in the form of a definition of the type of hemodynamics and the degree of gestosis. The determination of the type of hemodynamics and the degree of gestosis allows the diagnostician and the obstetrician-gynecologist to assess the critical state of the pregnant woman at the time of the study and to take the necessary treatment measures. Conclusion. In order to diagnose gestosis, a neural network was synthesized, which allowed classifying the pathology of pregnant women using neuro-fuzzy simulation in a Matlab environment. The application of the proposed system helps choose the tactics of treating a patient diagnosed with gestosis according to individually selected therapy, monitoring its effectiveness, which will have a positive effect on the course and outcome of pregnancy; most importantly, controlling the state of maternal hemodynamics will eliminate the unreasonable use of medications.
oai:ojs.radap.kpi.ua:article/1458
2018-03-30T17:41:02Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1458
2018-03-30T17:41:02Z
N
No. 72 (2018); 47-52
Segmentation of anatomical heart structures in Ensite Verismo software for radiofrequency ablation of arrhythmogenic tissues
Filimonova, V. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Sychyk, M. M.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Tarasova, L. D.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Kravchuk, B. B.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine
Batsak, B. V.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine
Pokanievych, A. V.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine
2018-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1458
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Review of the problem. The relevance of the research is the need of a high-quality imaging of the left atrium anatomy for the effectiveness of radiofraquency ablation of arrhythmogenic tissue of the myocardium in real time. For its safety it is important to assess the attachment of the esophagus to the wall of the heart. Nowadays, methods of visualization of real anatomical structures are dynamically developed on the basis of data processing of DICOM computer and magnetic resonance imaging, including for the reconstruction of 3D anatomy of the heart. Purpose of research. The task of the research was to construct a three-dimensional model of the anatomical structures of the heart and the nearby organs (pulmonary veins, esophagus) in EnSite Verismo software environment (St.Jude Medical, USA) and to implement the technique in clinical practice in order to improve the accuracy of visualization, safety and efficacy of RFA in X-ray conditions in real time. Metodology. The research was carried out at the M.M. Amosov National Institute of Cardiovascular Surgery Ukraine NAMS of Ukraine with the use of modern specialized high-tech medical equipment and clinical materials, computer tomography images (CT) of the patient's heart N. obtained in the radiation diagnostics department and data of the electroanatomic mapping of the patient's heart in the department of treatment of arrhythmias with X-ray surgery. The approach for conducting RFA with the EnSite Verismo software was implemented using the following algorithm:Receiving and preserving CT scans of the patient in the DICOM format.Downloading "gray" images into the EnSite Verismo software.Construction of a 3D model of anatomical structures of the heart, pulmonary veins and esophagus by the segmentation of CT images.Export of model to the EnSite NavX system (St. Jude Medical, USA).Combination of a segmented model and electroanatomical map in the EnSite NavX system for further radiofrequency ablation.An algorithm for 3D segmentation of the left atrium, pulmonary veins and esophagus in the EnSite Verismo software is developed. It is based on the threshold method of splitting the image into an area for which a certain homogeneity criterion is fulfilled. Result and conclusions. The developed algorithm for segmentation of the left atrium, pulmonary veins and esophagus for the EnSite Verismo allows for the construction of an exact anatomy of structures. The 3D model of individual anatomy of the heart provides the information for surgeon during RFA about the features of the structure of the left atrium: the location of the pulmonary veins in order to avoid vein stenosis; the localisation of the esophagus in order to apply ablation very carefully, so as not to make the perforation of the esophagus. A 3D model, supplemented by an electro-anatomical map of the left atrium that shows, in addition to anatomy, the order of activation of heart miocardium and localization of arrhythmia, will increase the efficiency and safety of RFA.
oai:ojs.radap.kpi.ua:article/1464
2018-03-31T07:26:01Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1464
2018-03-31T07:26:01Z
N
No. 72 (2018); 53-61
Dynamics of Bioimpedance Parameters on Three Frequencies During Ultrafiltration
Sharpan, O. B.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Mosiychuk, V. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Arkhypska, M. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Tkachuk, B. V.; National Technical Universitet "Kharkiv Politechnical institute"; Kharkiv Regional Clinical Center of Urology and Nephrology
Tomashevskyi, R. S.; National Technical Universitet "Kharkiv Politechnical institute"
2018-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1464
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Background/Aim. At present, methods based on the analysis of non-invasively measured parameters of electrical bioimpedance for the diagnosis of the patient's biohydrality are of interest. The purpose of this article is to investigate the dynamics of electrical impedance parameters (module, phase angle, active and reactive components) of the human body during ultrafiltration of programmed hemodialysis at three frequencies of 20 kHz, 100 kHz, 500 kHz. Equipment and Methods. For the research was used the hemodialysis system Fresenius Medical Care 5008C. This system provided the implementation of the ultrafiltration procedure profile. Also was used the hardware and software complex of monitoring bioimpedasometry TOR-M-1, adapted for hemodialysis procedure and conditions. Using these equipment the dependences of the modulus Z, the phase angle $ \varphi $, active R and the reactive X impedance components corrected to the body length of the patient H, the region of distribution of the bioimpedance vector relative to the tolerance ellipses and the dynamics of these parameters, depending on the volume of the ultrafiltrate and the profile of the ultrafiltration procedure were studied. Dynamics of bioimpedance parameters. It was found that during the ultrafiltration has a characteristic complex nonlinear behavior of the impedance parameters for each individual patient. The intensity of this nonlinearity increases with increasing frequency. It is expressively observed at higher frequencies of 100 kHz and 500 kHz. Interpretation of Impedance Dynamics with Tolerance Ellipses. The non-stationary oscillatory character of the parameter dynamics testifies to the complexity of the individual transient processes of redistribution of volumes of human water sectors in the process of hemodialysis and associated with changes in the ratio of intracellular, extracellular fluids and blood, the structural composition of the liquid. This causes fast flowing changes in active conductivity in the intercellular environment and reactive conductivity due to the action of polarization processes on the dielectric structures of biological tissues. Discussion and Conclusion. Measurements and cumulative analysis of the parameters of electrical impedance directly in the process of hemodialysis allows to objectively monitor the progress of the patient's functional state in real time with an assessment of the presence or absence of a `dry weight 'level, evaluate the nature of the processes of redistribution of intracellular and extracellular sectors of the body and blood, and the differences in the course of the process of ultrafiltration of patients. This can be the basis, if necessary, for promptly adjusting the ultrafiltration process. Widening of the impedance measurement bandwidth enhances the diagnostic capabilities of such monitoring and the timely correction of the ultrafiltration procedure.
oai:ojs.radap.kpi.ua:article/1483
2018-06-30T23:12:18Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1483
2018-06-30T23:12:18Z
N
No. 73 (2018); 33-39
Selection of the optimal order for multivariate autoregressive model of electroencephalograms for patients with epilepsy
Kotiuchyi, I. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Popov, A. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Kharytonov, V. I.; TMO "Psychiatry", Kyiv
2018-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1483
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Introduction. Brain electrical activity signals (or EEG) by their very nature are non-stationary time series. This basically allows applying a set of mathematical-statistical analysis methods to them. One of the most common methods for signal analyzing is the construction of autoregressive mathematical models and analysis of their parameters in order to obtain additional information about the signal itself or causality between signals. In multivariate autoregressive (MVAR) modeling of EEG, the main issue is the optimal choice of model order. In this work, the approach for selecting the optimal order of MVAR models of brain electrical activity signals of subjects diagnosed with epilepsy is proposed. MVAR modeling. The autoregressive model assumes that the current sample of the discrete signal can be linearly predicted as a weighted sum of its previous samples. MVAR model extends this assumption to multiple time series so that the vector of current samples of all signals is modeled as a linear sum of their previous samples. MVAR models of EEG signals essentially are formed by solving systems of linear equations. The Yule-Walker method of linear equations systems solving is used in this paper. The accuracy of EEG modeling depends on the order of model. Each model order influenced by the amount of delay between current samples and last previous samples used to generate the model. To assess the order and quality of models the Schwarz-Bayes information criterion (SBC) is used in this work taking into account the covariance matrix of the residuals. Additionally, the quality is assessed by Pearson's correlation coefficient between the real and simulated data. In this paper, the MVAR modeling and statistical analysis of the models' optimal orders of the input signal periods before, during and after an epileptic seizure is carried out. Experimental results. Two sets of EEG data with generalized and focal epileptic seizures are used. The first group of patients with focal seizures consists of 26 people and more than 100 epileptic seizures. The second group with generalized seizures consists of 11 people and about 50 epileptic seizures. For EEG signals modeling, values of orders in a range from 1 to 22 are used. Consequently, for each investigated period of signal (before, during and after a seizure), 22 different MVAR models are constructed and compared. After modeling, the obtained models for each order value are evaluated using the SBC criterion. Conclusions. According to the results, it is recommended to choose the order of MVAR models of EEG signals in the predefined range of orders from 11 to 13. Since the sampling rate of the signals used in these experiments is 250 Hz, the specified range of order values indicates that MVAR-modelling of one signal includes information that contains all other signals with a delay of 44-52 ms. Therefore, theoretically, it is possible to allocate functional characteristics of brain electrical activity for patients with epilepsy that occur synchronously in different parts of the brain and spread at an average of 50 ms. Moreover, the ways of further research of electrical brain activity and functional connections of brain regions during epileptic activity are indicated.
oai:ojs.radap.kpi.ua:article/1502
2018-09-30T12:42:13Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1502
2018-09-30T12:42:13Z
N
No. 74 (2018); 51-59
Modeling of Electromechanical Characteristics of Piezoresonance Pressure Sensors with Membrane Control of the Interelectrode Gap of a Piezoelectric Element
Taranchuk, A. A.; Khmelnytskyi National University
Pidchenko, S. K.; Khmelnytskyi National University
Zhyznevskyi, A. I.; Khmelnytskyi National University
2018-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1502
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The paper considers the issues of increasing the simulation accuracy of perspective piezoresonance overpressure sensors with membrane control of the piezoelectric element interelectrode gap. A comparative analysis of elastic membrane elements characteristics made of alloys two different types, calculated by the existing methods for flat and corrugated membranes, and obtained by simulation in the COMSOL Multiphysics system is carried out. It is shown that the existing analytical methods for calculating membrane elements are of an approximate nature and allow only rough estimates to be obtained, since they do not take into account all the structural features of the elastic elements and are adapted to the experimental designs of sensors with a specific geometry. The elastic characteristics of the measuring diaphragm of pressure sensors with a variable interelectrode gap of excitation are calculated. The capacitance of the interelectrode gap of the membrane pressure sensor is determined. Numerical simulation of the stressed-deformed state of the corrugated membrane in the COMSOL Multiphysics software package was carried out. The operating characteristics of the piezoresonance sensor of excess pressure with variable inter electrode gap of excitation are studied. The developed three-dimensional model of the sensor of excessive pressure for medical applications makes it possible to significantly improve the accuracy of characteristics calculations of the stress-strain state of elements during their micro-displacements, remove the limitations on the structural features of the membrane and its attachment methods, and significantly shorten the time and costs for developing measuring transducers. The obtained results provide ample opportunities to optimize the design of the sensor, improve its accuracy and reduce the impact on it of destabilizing environmental factors.
oai:ojs.radap.kpi.ua:article/1523
2019-09-30T22:06:05Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1523
2019-09-30T22:06:05Z
N
No. 78 (2019); 52-59
Frequency Dependences of the Rhinological Parameters of Electrical Bioimpedance in the Area of the Paranasal and Nasal Sinuses
Sharpan, O. B.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Mosiychuk, V. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2019-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1523
Introduction. Possibilities of three-frequency broadband electrical bioimpedanceometry of the nasal and paranasal regions were investigated.Research methodology and equipment. The studies were performed experimentally non-invasively using a three-frequency wideband bioimpedance system TOR-M-1, adapted to the conditions and requirements of rhinological studies. The TOR-M-1 system provides the measurement of the module Z and the phase angle φ of the impedance of the human body sections at three frequencies of 20 kHz, 100 kHz and 500 kHz with programmatic calculation of active R, reactive X components of the impedance at these frequencies. Non-invasive impedance parameters were measured using a tetrapolar technique using paired stainless steel active electrodes connected to the human body in the area between the cheek and the hand.Results and Discussion. It is established that the values of the module, phase angle, active and reactive components of the impedance at these frequencies are individually individual for a particular person and change dynamically in the presence of rhinological diseases. The most characteristic features that characterize the normal and abnormal conditions of the nasal and paranasal tissues, are concentrated in the frequency dependences of the phase angle.Conclusions. Cole diagrams for groups of patients with certain phase-to-angle ratios at three frequencies show the possibility of determining different functional states of patients: the normal state, the presence of residual phenomena of rhinological diseases, while the subjective person feels normal and active disease. The results of impedance frequency parameters dynamics during respiratory disease are presented.
oai:ojs.radap.kpi.ua:article/1548
2019-03-31T09:38:14Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1548
2019-03-31T09:38:14Z
N
No. 76 (2019); 63-71
Signal transducer of functionally integrated thermomagnetic sensors
Barylo, G. I.; Lviv Polytechnic National University
Boyko, O. V.; Danylo Halytsky Lviv National Medical University
Holyaka, R. L.; Lviv Polytechnic National University
Marusenkova, T. A.; Lviv Polytechnic National University
Prudyus, I. N.; Lviv Polytechnic National University
Fabirovskyy, S. E.; Lviv Polytechnic National University
2019-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1548
Introduction. The article is dealing with the sensors analog front-end development in accordance to concepts of Lab-on-Chip and Internet of Things. The task of functional integration, the basis of which is the combination of several complementary methods of measurement in one device, is pointed. Basic approaches to functional integration. Functional integration provides the ability to use the same microelectronic structure for controlled heating, measuring the temperature, and measuring the changes of the investigated sample characteristics under the influence of external influence. Functional integrated magneto-transistor converter. The main advantages of used magneto-transistors are high signal-to-noise ratio, increased resistance to magneto-induction interferences, and multi-modes and multi-functionality. The last advantage is decisive for solving the problem of a single chip functionally integration. The principle of operation and the circuit diagram of the signal converter. The signal converter provides three functional properties on single chip magneto-transistor structure. The first is the magnetic field measurement. The second is controlled heating of the structure. And, the third property is the measurement of the temperature of the structure of the magneto-transistor with investigated substance placed on this structure. Hardware-software implementation of the signal converter. The signal converter has been implemented on the Programmable System on Chip PSoC 5LP (Cypress Semiconductor). The module CY8CKIT-059 Prototyping Kit has been used. The developed software for controlling the measurement process provides controlling the duration of the heating pulses and relaxation, the number of measurements in each thermal cycle, coefficients of measuring transformation functions, API operating modes commands, etc. Conclusions. The novelty of the obtained results is the implementation of the sensor device for thermomagnetic analysis on the lateral magneto-transistors single chip structure. The areas of application are sensors for materials science, biophysics and medicine in the concept of the Internet of Things.
oai:ojs.radap.kpi.ua:article/1565
2019-07-01T18:53:02Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1565
2019-07-01T18:53:02Z
N
No. 77 (2019); 66-73
Imitation Modeling of the Daily Pulse Signal for Long-Term Monitoring Systems
Hvostivska, L. V.; Ternopil Ivan Puluj National Technical University
Oksukhivska, H. M.; Ternopil Ivan Puluj National Technical University
Hvostivskyy, M. O.; Ternopil Ivan Puluj National Technical University
Shadrina, H. M.; Ternopil Ivan Puluj National Technical University
2019-06-20
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1565
The imitation model of the daily (24 hours) pulse signal is developed on the basis of its mathematical model in the form of the periodically elongated sums of two functions with normal distribution and exponential attenuation. Unlike existing models this one takes into account the randomness arising as a result of the internal and external noises influence, periodicity related to the nature of the pulse signal generation, changing of the oscillation phase as a result of the vessels stiffness changing, the amplitude of the direct and reflected waves of the human vessels blood flow and the day and night structure (i.e. changes in the human cardiovascular system and brain functioning during the day and night). The imitation model makes it possible, based on known medical parameters, to simulate the daily pulse signals of pathologies and norms for the task of the methods for such signals processing in the long-term monitoring systems verification. This is important in the timely diagnosis of the human vessels state for the correct diseases treatment and prevention. Based on the imitation model and the Matlab environment software the algorithms of the daily pulse signal processing and the corresponding graphical user interface are developed. The magnitudes of the pulse signals amplitude, durations, moments of the blood filling maximum time and a number of the other parameters which are characteristic of the pulse signal direct and reflected waves, as well as the number of the day and night stages and their time duration are the input data for such signals simulation. The testing procedure of the developed software for the daily pulse signals modeling is carried out. It is established that obtained simulated implementation of daily pulse signals provide a complete reproduction of the experimental signals form in time and amplitude parameters of the direct and reflected waves. This gives grounds to assert that the developed imitation model is suitable for using in the long-term monitoring systems.
oai:ojs.radap.kpi.ua:article/1601
2019-12-31T18:34:48Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1601
2019-12-31T18:34:48Z
N
No. 79 (2019); 78-84
Development of methods and algorithms for a stochastic biomedical signal period calculation in medical computer diagnostic systems
Hvostivska, L. V.; Ternopil Ivan Puluj National Technical University
Osukhivska, H. M.; Ternopil Ivan Puluj National Technical University
Hvostivskyy, M. O.; Ternopil Ivan Puluj National Technical University
Shadrina, H. M.; Ternopil Ivan Puluj National Technical University
Dediv, I. Yu.; Ternopil Ivan Puluj National Technical University
2019-12-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1601
An method and algorithm for a stochastic biomedical signal period calculation is developed, which characterized by high resolution and performance, suitable for using in biomedical computer diagnostic systems. The method and algorithm is implemented on the basis of determination a minimum of a centered biomedical signal mean values functional variation procedure. The results of existing algorithms operation for biomedical signals period calculation by known methods based on: averaging of time intervals between a biosignal realization maximum values, averaging of intervals between a biosignal amplitude spectra maximum values, averaging of time intervals between a biosignal autocorrelation function maximum values and averaging of time intervals between maximum values of a power spectral density are analyzed. The calculation results obtained by different methods differ, which in turn leads to ambiguous results of the biomedical signal processing.
Algorithmic and software designed to calculate the stochastic biomedical signal period makes it possible to reduce the calculation estimates blur in medical computer diagnostic systems, because, unlike the known methods, the developed one has a small scatter of the standard deviation at the biomedical signal ensemble realizations synchronization and lower algorithmic complexity, which leads to calculations performance increasing.
The software is implemented in the Matlab environment.
The developed algorithm verification procedure is carried out by means of simulation. The verification results 100% confirmed the accuracy of a priori known test signal period determination.
oai:ojs.radap.kpi.ua:article/1609
2020-04-01T08:08:16Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1609
2020-04-01T08:08:16Z
N
No. 80 (2020); 73-78
Transmittion of Heart Sounds by Means of Auscultation
Storchun, Y. V. ; Lviv Polytechnic National University
Yakovenko, Y. I.; Lviv Polytechnic National University
Smerdova , T. A. ; Lviv Polytechnic National University
2020-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1609
The article presents the results of the study of the amplitude-frequency characteristics of the electron stethoscope / phonendoscope with a sound-conducting tube in the frequency range (50 - 400) Hz, which according to different estimates belongs to the spectrum of II tones of the human heart. Modeling is carried out taking into account mechanical impedance of the human chest area. In order to generalize the results, in contrast to the zone of registration of II tone, the area located in the fourth intercostal margin along the right middle clavicle line with known parameters was chosen. Mechanical impedance of the site, according to the measurement data, was interpreted by the system of sequentially connected elements with concentrated parameters: elasticity, friction resistance and vibrational mass. The friction resistance was determined by the minimum of the impedance modulus, the elasticity of the latter at low frequencies (50 Hz), and the vibrational mass at high frequencies (1000 Hz). The stethoscope/phonendoscope were modeled by elements with concentrated and distributed parameters. The stiffness of the phonendoscope membrane was determined by experimental measurements and the resonance frequency by calculations. The sound conducting tube was simulated by the system with distributed parameters. It was accepted that the mechanical impedance of the load of the sound-conducting tube in the frequency range under study had an elastic character, taking into account the frequency range of the microphone. At low frequencies, the input impedance of the phonendoscope prevailed over that of the stethoscope. For the rigidity of the microphone membrane of more than 103 N/m in the studied frequency range there are bands with a significant predominance of impedance of the human body or means of auscultation of heart sounds. In the first case, the heart's sound system operates in the preset pressure mode, while in the second case, it operates at an oscillatory speed. In the case of a preset pressure, the transmission functions of the stethoscope and the phonendoscope are different, while the preset oscillatory speed is similar. In the frequency bands in which the ausculators functioned at a given oscillatory speed, there was a decrease in sounds and a slight increase in the given pressure.
oai:ojs.radap.kpi.ua:article/1614
2020-07-02T02:39:56Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1614
2020-07-02T02:39:56Z
N
No. 81 (2020); 65-71
Features of testing and selection of implant-valves to reduce intraocular pressure
Tkachuk, R. A.; Ternopil Ivan Puluj National Technical University, Ternopil
Yanenko, O. P.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2020-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1614
Introduction. The progress of microelectronic technology and its associated element base stimulates its widespread introduction into various spheres of human activity. By using micro miniaturization, we get new devices and systems with increased reliability and extended functional and operational capabilities and improved metrological parameters. This fully applies to the field of medical instrumentation and bioengineering, especially in the field of ophthalmology new devices and sys, is characterized by the wide use of implants ranging from lens replacement to radiated (at 914 MHz) microchip (size 1.2x2.4 mm) to measure and regulate eye pressure, only goes through laboratory testing. One of the most severe diseases in ophthalmology is glaucoma of the eye, which leads to an increase in intraocular pressure, most of which leads to a loss of human vision and is the second most frequently occurring. The most effective method of treatment is eye surgery, which is the patient's last chance to keep his eyesight, an implant (valve) to regulate the pressure within 9-21 mm Hg. The obligatory preoperative procedure should be the control of the operation parameter and determination of parameters, the opening pressure, closing pressure, and reproducibility of the characteristic at reactivation, which will contribute to the efficiency of performed operations.Analysis of known research results. There are known several methods of implants testing for workability, which can divide into two directions: methods with the use of earth gravity by lifting the tank with saline solution to the graduated height with using of measuring bar or analog or digital manometer and method of hardware creation of excess pressure. The disadvantages of the considered methods and devices for their realization are the considerable inaccuracy and insufficient sensitivity, as well as the difficulty of recording the moment of valve actuation, which depends on the operator's professionalism and, correspondingly, some subjectivity in determining the implants' parameters, which reduces the effectiveness of determining their suitability for use.Purpose of work description of an automated system. Taking into account the revealed disadvantages the authors set a task to develop a simplified measurement scheme with increasing sensitivity, accuracy and objectivity of implant parameters determination and their effectiveness by determining their suitability for use in medical-surgical practice. For the realization of the target, the authors developed a structural scheme of the automated system for measuring and controlling the parameters of the intraocular pressure regulation implants on the basis of the microsystem technology elements. The system contains a computer, a microcontroller, with a control impulse generator, a unit of discrete (step-by-step) pressure increase with 0.025 ml/step, a microelectromechanical pressure sensor, resistive liquid sensor, analog-to-digital converter, and two feedback lines to the microcontroller, with a microelectromechanical pressure sensor and liquid detector. The algorithm of the system operation is developed, which implies checking the system in the "zero adjustment mode" and the mode of measuring and controlling the implant parameters "testing mode". It is showed that the error of determining the system pressure parameters does not exceed 0,5%.Experimental verification of system operation. There are three possible cases in which the implant is opened earlier and there is a risk of hypotension to the patient's eye, and later there is a risk of hypertension and works in the normal pressure zone. The authors give graphs of such measurements, as well as a graph of the reproducibility of the characteristics of the non-defective implant.Conclusions. Thus, the proposed system provides: -- simplification of the circuit with the simultaneous possibility to automate the process of preoperative verification of different implant types; -- allows increasing of sensitivity, accuracy of measurement and objectivity of implant parameters determination; -- determining their suitability for use in medical surgery by fluid output parameters, opening pressure, closing pressure, and reactivation characteristics that will improve the efficiency of the operation; -- reduction of implant testing time, which is limited to 2-3 minutes, and the ability to store parameter information in both electronic (computer) and paper form.
oai:ojs.radap.kpi.ua:article/1629
2020-07-01T01:41:27Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1629
2020-07-01T01:41:27Z
N
No. 81 (2020); 56-64
The Method of the Main Tone Detection in the Structure of Electromyographic Signals for the Task of Broken Human Communicative Function Compensation
Dozorska , O. F. ; Тернопільський національний технічний університет імені Івана Пулюя
Yavorska , E. B. ; Тернопільський національний технічний університет імені Івана Пулюя
Dozorskyi, V. G.; Тернопільський національний технічний університет імені Івана Пулюя
Dediv , L. Ye.; Тернопільський національний технічний університет імені Івана Пулюя
Dediv , I. Yu.; Тернопільський національний технічний університет імені Івана Пулюя
2020-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1629
In the work the method of electromyographic signals processing for the task of broken human communicative function compensation is developed. The method allows to detect the signs of main tone in the structure of electromyographic signals, that were recorded from the surface of patients neck near the vocal folds. Using this signs it is possible to identify the mentally spoken vowel and vocalised consonant phonemes and to identify the speech of patients with broken or lost communicative function. The developed method includes two stages, namely: preparatory and basic. The purpose of the preparatory stage is to obtain data on the individual features of the patient's speach, in particular the approximate value of the main tone frequency and the frequency interval of the main tone frequency when patient is trying to utter test sequences of sounds at certain points in time. These data are necessary to enable the use of the basic stage of the method, which involves the processing of electromyographic signals recorded in an arbitrary attempt to pronounce arbitrary sounds, words or phrases by the patient. It is proposed to processing the electromyographic signals by methods of spectral-correlation analysis using the sliding window method if presenting of such biosignals in the form of a piecewise stationary random process to detect the time intervals of the presence of main tone signs. Within each sliding window the estimates of the power spectral density distribution are calculated and averaged over the frequency and power within the predetermined interval of existence of the main tone frequency. The obtained averaged estimates make it possible to set the time intervals of the main tone presence and, accordingly, the subsequent identification of vowel and consonant vocalised phonemes. The experimentally registered EMG signal was processed by the developed method with different values of the sliding window width.
oai:ojs.radap.kpi.ua:article/1660
2021-03-31T18:26:45Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1660
2021-03-31T18:26:45Z
N
No. 84 (2021); 57-65
Cloud-based service for visual monitoring of the patient's functional state dynamics using the electrical bioimpedance parameters
Mosiychuk, V. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Sharpan, O. B.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
2021-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1660
Background/Aim. The results of the development of its own cloud service and a flexible web interface of the electrical bioimpedance measurement system are presented. The purpose of this article is to investigate and describe additional cloud service which is posible to use in the problems of diagnosing body composition and its biohydration. The system provides the organization and convenient operational control of the diagnostic or therapeutic procedure based on the direct determination and dynamics of the constituent parameters of the electrical bioimpedance (module, phase angle, active and reactive components) in an extended frequency band.System implementation. The features and conditions for the implementation of such a system are considered on the example of the problem of diagnosing the dynamics of the water status of a person directly during an ultrafiltration session of the hemodialysis procedure. In this case, the structure combines an ``artificial kidney'' apparatus, a bioimpedance meter and a cloud service with processing and display of input data into a single system.Accumulation and analysis of clinical data. Measurement of electrical bioimpedance parameters is carried out at three fixed frequencies of 20 kHz, 100 kHz and 500 kHz in automatic mode during the entire ultrafiltration session. The data obtained through API during measurements is displayed in the web interface. Discussion and Conclusion. The indicated impedance parameters are used as diagnostic indicators, as well as the position of the impedance vectors on the complex plane relative to the ``tolerance ellipses''. Focusing on the dynamic changes in bioimpedance parameters, it is possible to objectively assess the functional state dynamic of the patient and correctness of any treatment procedure.
oai:ojs.radap.kpi.ua:article/1678
2021-03-31T18:26:45Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1678
2021-03-31T18:26:45Z
N
No. 84 (2021); 66-77
Software, mathematical and algorithmic tools for the computer electroencephalography system of humans epilepsy manifestations detecting
Khvostivskyy , M. O.; Тернопільський національний технічний університет імені Івана Пулюя
Khvostivska , L. V.; Ternopil Ivan Puluj National Technical University
Boyko , R. R.; Ternopil Ivan Puluj National Technical University
2021-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1678
Mathematical, algorithmic and software have been developed as a part of a computer electroencephalographic system. It is based on a 24 hours processing of an EEG signal in a form of a piecewise random sequence of white noises and an additive mixture of harmonic functions with different frequencies for hidden epilepsy time zones detection. The method of epilepsy detecting is based on a procedure of covariance treatment using covariators with basic harmonic functions of frequencies in the range from f1 to f2 within the sliding window, which moves along a sample of values of the EEG signal lasting 24 hours.
Based on the mathematical model and processing method, an algorithm and software have been developed for computer electroencephalographic systems using the MATLAB application package. According to the results of the EEG signal lasting 24 hours experimental data processing, it was found that at the time moments of epilepsy there is covariation average power increasing compared to time moments without epilepsy. Therefore, estimates of covariators EEG signal within 24 hours respond quantitatively to the manifestations of epilepsy.
To verify the developed mathematical, algorithmic support and software there was generated a test signal in the form of the harmonic components sum in given time zones, (characteristic of the EEG signal) at the time of epilepsy, and white noise - in time zones without epilepsy. The results of the generated test signal processing confirmed the correctness of the detection of the areas of harmonic components appearance that induce the manifestation of epilepsy.
oai:ojs.radap.kpi.ua:article/1695
2020-12-30T01:24:53Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1695
2020-12-30T01:24:53Z
N
No. 83 (2020); 55-61
Comparison of Monopolar and Bipolar Cox-Maze Ablation Based on Clinical Data and Mathematical Modeling
Stasiuk, Y. P.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”
Sychyk, M. M.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Maksymenko, V. B.; M. Amosov National Institute of Cardiovascular Surgery NAMS of Ukraine ; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Kravchuk, B. B. ; Amosov National Institute of Cardiovascular Surgery
2020-12-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1695
Purpose: Today radiofrequency heart ablation is gold standard for the radical surgical treatment of different types of heart rhythm disturbances.The purpose of the research is a comparative analysis of monopolar and bipolar electrodes for ablation during open heart surgery (Cox-Maze ablation).
Methods: The analysis is made based on clinical data and mathematical modeling. By the use of system of electro-anatomical mapping of radiofrequency ablation zones a three-dimensional model of left atrium is created. Then a potential map, which represents the amplitude of myocardium activity, is imposed on this model. The amplitude of myocardium activity, the width and depth of the electro-thermal destruction zone and the ablation line continuity are main parameters of clinical data analysis. For mathematical modeling the COMSOL Multiphysics 5.4 software is used. Two variation of mathematical model for monopolar and bipolar ablation are created. Main analysis parameters of mathematical modeling are: diagrams of thermal field distribution, size of myocardial tissue destruction, and duration of the ablation procedure.
Results: Both monopolar and bipolar ablation can be used for Cox-Maze procedure. But potential map and mathematical modeling show that with monopolar ablation the destruction zone has a hemispherical shape and scar line is not uniform along the depth of a heated myocardial tissue. It can lead to a recovery of pathological signals conduction from the pulmonary veins to the atrium. Uneven distribution of thermal fields with a clearly defined maximum increases the risk of evaporation and microexplosions. At the same time the duration of monopolar ablation is significantly longer.
Conclusion: It is shown that bipolar ablation has advantages in pulmonary veins isolation. This type of instruments allows creation of effective and safe uniform thermal transmural destruction with only one application of radiofrequency current energy.
oai:ojs.radap.kpi.ua:article/1710
2021-03-31T18:26:45Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1710
2021-03-31T18:26:45Z
N
No. 84 (2021); 78-87
Investigation of Lung Sounds Features for Detection of Bronchitis and COPD Using Machine Learning Methods
Porieva, H. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute"
Ivanko, K. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Kyiv, Ukraine
Semkiv , C. I.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Vaityshyn , V. I.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
2021-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1710
The study is dedicated to the issue of investigation of the lung sounds digital analysis processing methods, searching for new informative features of pathological respiratory sounds and using machine learning methods for classifying the state of the bronchopulmonary system. In particular, the use of various methods of lung sounds analysis is considered, namely: frequency, time-frequency, wavelet, and mel-frequency cepstral analysis. The application of signal processing methods to the problem of respiration signals analysis is considered in the paper. In order to investigate the possibilities of machine learning to the problem of classification of respiration signals, the dataset of lung sounds of 296 recordings, which represent 3 classes: norm, bronchitis, and chronic obstructive pulmonary disease, was used in this work. The purpose of this study is to identify and compare the informative features of the lung sounds obtained with different signal processing methods, as well as to choose the classification method that provides the highest accuracy in the identification of the bronchopulmonary system condition. To obtain frequency features, power spectrum density dependence on frequency was calculated for respiratory signals using fast Fourier transform method. The spectral measures, as well as ratios of spectrum powers in different frequency bands, were defined. To extract the spectral-temporal features of the lung sounds, the spectrograms of the analyzed signals were investigated. The mean time dependences of the power spectral density in the indicated frequency ranges were determined. The sum of magnitudes values of the power spectrum curve for each frequency band was used as the features obtained from the spectrogram. The ratios of the energies corresponding to detail levels of the wavelet decomposition to the total energy of the decomposed signal were used as the parameters of signal recognition based on wavelet analysis. The logarithmic (mel) filterbank energies, averaged over time frames, depending on channel index and time, as well as mel frequency cepstrum depending on cepstrum index and time, are proposed to use as features derived from mel-cepstral analysis. The supervised machine learning based on decision trees, discriminant analysis, support vector machines, logistic regression, k-nearest neighbors classifiers, and ensemble learning were applied to determine the best classification models for computerized disease screening. The accuracy of the different classifiers using these feature sets was determined and compared. Based on this, a combination of features and classifiers, which provides the highest accuracy of lung condition recognition, reaching 93%, is proposed.
oai:ojs.radap.kpi.ua:article/1719
2021-06-30T22:35:18Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1719
2021-06-30T22:35:18Z
N
No. 85 (2021); 41-47
Features of Low-Intensity Energy Balance in the Process of Physiotherapeutic Application of Mixtures of Natural Materials
Yanenko , О. P.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Peregudov , S. М.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Shevchenko , К. L.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Golovchanska , О. D.; O. O. Bogomolets National Medical University of Ukraine, Kyiv, Ukraine
2021-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1719
The authors investigated the features of energy balance that provide the process of using natural materials in physiotherapeutic thermal procedures. Substances such as ozokerite, paraffin, naphthalene, muds and their combinations are widely used in physiotherapy, so it is important not only to know the parameters of the heat exchange, but also the distribution of other types of energy that can affect the effectiveness of treatment. The authors theoretically substantiated and experimentally proved that microwave component is presented in the radiation spectrum of the ozokerite applicator. The level of radiation in the millimeter range of the applicator with a size of 10x10 cm is compared with the level of low-intensity signals of technical devices for millimeter therapy. The dynamic change of the radiation level of the microwave component during the cooling of the applicator from the maximum temperature of 50°С to the temperature of the human body surface was investigated. It was revealed that the sign of the radiation of the millimeter component in relation to the human body changes. This results in the formation of positive and negative low-intensity flows of microwave radiation. The frequency ranges of these flows and their level were investigated. It has been found that changing the percentage of paraffin in ozokerite can affect the level and range of negative microwave flows. The results of previous studies by the authors, which substantiate the positive effect of negative flows, including ozokerite-paraffin therapy, in inflammatory processes with ''excess energy'' and other diseases, are adduced. The microwave electromagnetic radiation studied by the authors is a concomitant factor during the relevant physiotherapeutic procedures, in particular heat treatment. However, this factor can significantly affect the functional state of the human body, so it must be taken into account during physiotherapy procedures.
oai:ojs.radap.kpi.ua:article/1723
2021-06-30T22:35:18Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1723
2021-06-30T22:35:18Z
N
No. 85 (2021); 48-52
Method for Blink Detection in Single Channel of Invasive Electromyogram Signal
Bobrov, A. L.; Institute of otolaryngology named after prof. O.S. Kolomijchenko, National Academy of Medical Sciences of Ukraine, Ukraine
Borysenko, O. M.; Institute of otolaryngology named after prof. O.S. Kolomijchenko, National Academy of Medical Sciences of Ukraine, Ukraine
Popov, A. О.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
2021-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1723
Problem statement. Facial nerve damage is the cranial nervous system disorder often leading to facial muscle paralysis, which might be effectively restored using functional electrical stimulation of the fully or partially denervated circular muscle of the eye to achieve muscle contraction to close the eyelids. To control the invasive stimulation system, the automated detection of the blink event in the intact eye is used as a trigger. To achieve this, the new approach to single channel invasive electromyogram (EMG) signal analysis is proposed. Materials and Methods. The combined time-spectral approach to blink detection consists of the two stages, starting from the thresholding of filtered EMG signals in the sliding window, which is followed by comparing the total spectral power in the Fourier domain to minimum and maximum thresholds. If both conditions are met, the EMG in the current window is considered to contain the blink event. In the experiment, the EMG data recorded from the one male adult healthy volunteer is used, the signal contained an acceptable amount of artefacts and was recognized as reflecting the usual EMG. The true positive rate (TPR), positive predictive value (PPV), False Discovery Rate (FDR), and False Negative Rate (FNR) is used as a performance metrics. Results. In the result of applying the proposed blink detection algorithm with 500 ms duration of the time window and 100 ms overlap, the following performance metrics are obtained: TPR = 93%, PPV = 63%, FDR =7%, FNR = 37%. Impact. Acceptable true positive rate of blink detection suggests the method is promising for wider applications in the clinical settings and might be incorporated in the prototypes of implanted systems for facial muscle paralysis restoration using functional electrical stimulation for further development.
oai:ojs.radap.kpi.ua:article/1729
2021-06-30T22:35:18Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1729
2021-06-30T22:35:18Z
N
No. 85 (2021); 53-59
Solving the Inverse Problem of Relationship Between Action Potentials and Field Potentials in Cardiac Cells
Ivanushkina , N. G.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Ivanko , K. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Shpotak , M. O.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
Prokopenko , Y. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv
2021-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1729
Multiple electrode array (MEA) systems are the instrument platforms being used for cardiac extracellular electrophysiology investigation. Key applications of MEA technology are disease modeling and screening of drug effects. To solve these problems the efforts of many scientists are directed to signal processing and analysis of field potentials (FP) measured with MEA systems. However, it should be noted the complexity of interpretation of MEA information in non-invasive field potentials measurements of cardiac cells compared to invasive action potential (AP) recordings obtained using patch clamp technology. This study is devoted to the mathematical determination of the relationship between the signals of the electrical activity of cardiomyocytes: internal AP and external FP. Derivation of equations for transfer functions between AP and FP is based on field theory. This article provides a solution to the inverse problems of the relationship between AP and FP. Numerical experiments demonstrate the results of the inverse transformation of simulated field potentials signals. To denoise the potentials of the extracellular field of cardiomyocytes, the method combining wavelet transform and processing in eigensubspaces of cardiac cycles is used. The proposed method, based on transfer functions, can be used to determine AP parameters and expand the capabilities of data analysis in MEA systems for diagnosing heart disease and assessing cardiac toxicity during drug development.
oai:ojs.radap.kpi.ua:article/1787
2022-10-01T08:08:55Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1787
2022-10-01T08:08:55Z
N
No. 89 (2022); 39-47
Myocardial Ischemia Detection Using a Reduced Number of ECG Leads
Mnevets, A. V.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Ivanushkina, N. G.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Ivanko, K. О.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
2022-09-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1787
The study is devoted to the investigation of the electrocardiographic (ECG) features to distinguish norm and myocardial ischemia in reduced set of electrocardiographic leads. In particular, for myocardial ischemia detection the spectral features of the electrocardiographic signal and characteristics of the shape of ECG waves are considered. The main features commonly used for myocardial ischemia detection are described in the paper, as well as more reliable analogs are proposed for the considered task. The approach for ECG signal preprocessing, identification of the necessary signal segments and subsequent calculation of features is described in detail. The considered features are based on the areas under the characteristic waves of the ECG signal and the spectral distribution of these waves. The most informative features for myocardial ischemia detection are identified and selected from the initial set of parameters which led to a two-fold reduction in number of ECG leads comparing to the standard 12-lead electrocardiogram. The techniques for determining the proposed features, namely the ratio of the area under T wave to the area under the P wave, as well as the ratio of the area under T wave to the area of the entire cardiac cycle, are considered. These features together with other calculated parameters are assumed to describe the majority of pathology cases and gave a high accuracy of the classification ECG to norm and ischemic myocardial diseasesince they reflect the bioelectrical processes that occur in the presence of myocardial ischemia and manifest themselves on the surface ECG. Based on the analysis of principal components and the method t-distributed stochastic neighbor embedding, the distribution of data in the space of features that characterize the classes of norm and pathology was shown. Raw ECG data in norm and with cases of myocardial ischemia were obtained from the ''PTB Diagnostic ECG Database'' used in ''The PhysioNet/Computing in Cardiology Challenge 2020''. This database contains 22353 ECG records from 290 persons with 12 ECG leads (I, II, III, aVR, aVL, aVF, and V1–V6). The database contains the high-resolution ECG signals, which enabled to obtain 10,000 cardio cycles presenting norm and myocardial ischemia pathology for the subsequent training the machine learning algorithms. Based on the obtained features, various machine learning algorithms were trained and the accuracy was compared on different combinations of ECG leads. Аs a result of cross-validation, the accuracy of myocardial ischemia detection was 99% with a standard deviation of 0.4% for 6 leads (I, II, III, AVR, AVL, AVF) and 93% with a standard deviation of 0.12% for one lead (I). Thus, it was shown, that with machine learning methods it is possible to recognize ischemic myocardial disease with high accuracy and stability using six standard ECG leads or only one ECG lead.
oai:ojs.radap.kpi.ua:article/1826
2023-03-31T21:31:01Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1826
2023-03-31T21:31:01Z
N
No. 91 (2023); 63-71
Method and Algorithm of Electroencephalographic Signals Processing in Computer Medical Diagnostic Systems for Human Psychoemotional Indicators Detection
Khvostivskyy, M. О. ; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Pankiv, I. M. ; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Fuch, O. V.; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Khvostivska, L. V.; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Boyko, R. R.; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Dunetc, V. L.; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
Kartashov , V. V.; Ternopil Ivan Puluj National Technical University, Ternopil, Ukraine
2023-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1826
The method and algorithm for electroencephalographic signals processing during psychoemotional stress are developed to increase the informativeness of computer medical diagnostic systems in order to detect temporal transitions between various psychoemotional states in people. The method and algorithm for electroencephalographic signals processing is based on a mathematical model in the form of a periodically correlated random process and the synphase processing method without taking into account the relationship between correlation components as psycho-emotional indicators of a human. Such the model and method provide detection of the appearance of changes in the temporal structure of the electroencephalographic signal based on the data of changes in the periodic component in the form of averaged correlation components obtained within time-shift windows, which quantitatively reflect psycho-emotional changes in a humanin stressful situations.It is found that during the period of background exposure, there is a gradual decrease in the power level of the averaged correlation components of the electroencephalographic signal, during the period of negative influence, there is an increase in power, and during the recovery period, there is a decrease in the power of the components in relation to the two previous impacts.Software are developed based on the synphase method for electroencephalographic signals processing during psycho-emotional stress in the Matlab software environment.
oai:ojs.radap.kpi.ua:article/1923
2023-03-31T21:31:01Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1923
2023-03-31T21:31:01Z
N
No. 91 (2023); 53-62
Formation of Cardiointervalograms Based on Photoplethysmographic Realizations of Peripheral Pulse Signals
Guseva, E. V.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Mosiychuk, V. S.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Sharpan, O. B.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
2023-03-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1923
Features and possibilities of implementation of heart rate variability (HRV) cardiosystems based on the registration of peripheral photoplethysmographic pulse signals, which are easier and more convenient to register than electrocardiogram signals, are considered. The possibility of assessing the functional state using both long and short implementations of pulse signals without loss of accuracy in determining the diagnostic significance of statistical and spectral HRV parameters is indicated. The expediency of assessing heart rate variability not only by the parameters of one pulse signal registered at a certain point of the body, but also by the parameters of several such signals registered at different points of the human body, for example on the limbs, with an assessment of the differences in heart rate variability relative to the sagittal plane, is shown.A study was conducted to determine the duration of cardio intervals for pairs of pulse signals, simultaneously taken from two points of the human body — on the upper limbs relative to the sagittal plane. The accuracy of obtaining cardiointervalograms based on the formation of the durations of cardio cycles according to three characteristic contour points of pulse impulses — according to the maximum and minimum of the leading edge and the maximum of its steepness — was evaluated. A method of forming difference time series, representing the delay between different characteristic points of each signal separately and between the characteristic points of two signals of the same name, is proposed. The real possibility of using difference series to estimate HRV is shown due to the fact that such series may be more sensitive to minor changes in the state of the cardiovascular system.The results of the experiment on the processing of pairs of ultra short pulse photoplethysmographic signals with a duration of 60±10 s., measured simultaneously from the fingers of the left and right hands of the subject, which can be considered as the initial reaction of the tone relaxation process after the test exposure, are presented.
oai:ojs.radap.kpi.ua:article/1926
2023-06-30T21:37:31Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1926
2023-06-30T21:37:31Z
N
No. 92 (2023); 68-76
Acoustic Analysis of Articulation Tables of Numbers
Khvist , A. M.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Lunova , S. A.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Grebin , O. P.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
2023-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1926
The article uses the methods of acoustic analysis to study the sound material of the vocabulary sample, which forms an articulation table of numerals in the Ukrainian language.The adapted table of numerals is created by employees of the Institute of Otolaryngology of the National Academy of Medical Sciences of Ukraine based on the translation of a similar Russian-language articulation table by E. M. Harshaka and is recommended for testing the state of hearing.The authors of the article check the general compliance of the proposed test of numerals with the integral characteristics of the Ukrainian language, which is a mandatory condition for the use of the diagnostic test. For this, the method of estimating the averaged speech power spectrum is used. The text of the table is written according to standard requirements. The sound material is processed according to the methodology developed by the authors.The obtained integral spectrum of the sound material of the articulation table and its comparison with the average power spectrum of the Ukrainian language indicate the limited possibilities of using this test for comprehensive hearing diagnostics. In addition, the large size of the articulation table makes it impossible to read it in its entirety. The columns of numerals formed within the table are not interchangeable, as they have a significant difference in spectral characteristics.In the article, for direct testing, based on the general table of numerals, it is proposed to create separate diagnostic tables, balanced by columns or by rows based on the integral characteristics of the language. Balanced tables of numbers are formed according to the maximum difference of ±3 dB between the levels of the spectral density of the power of the sound material within the group in the analyzed frequency range. Recommendations are also provided for using the table of numbers as a test to test hearing and speech intelligibility.
oai:ojs.radap.kpi.ua:article/1935
2023-06-30T21:37:31Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1935
2023-06-30T21:37:31Z
N
No. 92 (2023); 77-83
Electromagnetic Compatibility of Implantable Biomaterials for Reconstructive and Restorative Surgery of Facial Bones
Yanenko , О. P.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Peregudov , S. М.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Shevchenko , К. L.; National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Kyiv, Ukraine
Malanchuk , V. O.; O. O. Bogomolets National Medical University of Ukraine, Kyiv, Ukraine
Shvydchenko , V. S.; O. O. Bogomolets National Medical University of Ukraine, Kyiv, Ukraine
Golovchanska , О. D.; O. O. Bogomolets National Medical University of Ukraine, Kyiv, Ukraine
2023-06-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1935
The critically important part for reconstructive and restorative surgical interventions in facial bones results is the interface of implant-tissue surfaces. The importance of taking into account the processes occurring at the border of the distribution of the implant and living tissue is due to many factors. Among them are well-known ones, such as biological compatibility, consistency of physicochemical parameters, etc. But, at the same time, the issues of electromagnetic interaction between implant materials and biological tissues remain unresolved. So, it's actual to investigate the interaction of implanted materials and tissues they are in contact. The authors considered the sources of formation of low-intensity microwave signals generated by the implant and living tissue. In this article, the authors demonstrate that microwave electromagnetic radiation is an important indicator and a new criterion for the physical compatibility of dielectric implantation biomaterials. It is proposed to use the term ``electromagnetic compatibility'' for the possibility of evaluating implant materials. This makes it possible to quantify the materials that come into contact with the human body during implantation. It should be noted that it is extremely difficult to measure the microwave radiation of the implant and biological tissue with existing technical means. This is due to the extremely low power of the emitted signals. The authors created a radiometric system with a sensitivity of 10-14 W. Using a highly sensitive radiometric system, a study of the radiation capacity of a number of implantable biomaterials was conducted. The possibility of forming positive and negative flows of microwave radiation, which can occur between adjacent tissues and implants, is shown. Violations of electromagnetic compatibility and, accordingly, the energy state of the surrounding biotissues, can qualitatively and quantitatively affect the reparative processes in the area of interventions, prolong the recovery period of adjacent tissues. So, it must be taken into account when choosing dielectric implant biomaterials.
oai:ojs.radap.kpi.ua:article/1962
2023-12-30T10:25:34Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1962
2023-12-30T10:25:34Z
N
No. 94 (2023); 49-57
Investigation of Fundus Images for Detection of Diabetic Retinopathy Stage Using Deep Learning
Basarab , M. R.; National Technical University of Ukraine ``Igor Sikorsky Kyiv Polytechnic Institute'', Kyiv, Ukraine
Ivanko , K. O.; National Technical University of Ukraine ``Igor Sikorsky Kyiv Polytechnic Institute'', Kyiv, Ukraine
2023-12-30
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
url:http://radap.kpi.ua/radiotechnique/article/view/1962
The study is dedicated to the investigation of diabetic retinopathy images by digital processing methods and further pathological outcome levels classification. The application of image processing methods to the problem of diabetic retinopathy (DR) analysis is considered in the paper. In order to investigate the possibilities of machine learning for the problem of classification of retinal images, the dataset of retinal images, which represent 5 classes: absence of DR, moderate, mild, proliferate stages, and severe DR, was used in this work. The aim of this study is to identify and compare the different image processing methods used for diabetic retinopathy detection, as well as to choose the classification method that provides the highest accuracy in the identification of the human retina condition.
The convolutional neural networks with tuned parameters such as EfficientNet and ResNet were applied to determine the best classification models for computerized disease screening. The accuracy and losses of the different models were determined and compared. Based on this, a combination of image preprocessing steps and neural network models, which provide the highest accuracy of diabetic retinopathy condition recognition, reaching 91.4% for the task of recognition of 5 classes (absence of DR and 4 stages of DR) is proposed. Intermediate stages in the development of diabetic retinopathy are the most difficult to distinguish: the best model showed 85.2% of correctly defined cases of moderate stage of diabetic retinopathy and 83% of correctly defined cases of mild stage.
Overall, this article highlights the significance of artificial intelligence (AI) and deep learning in the detection and classification of diabetic retinopathy. It underscores the need for improved screening methods, especially in underserved areas, and emphasizes the potential of these technologies in preserving vision, reducing healthcare professionals' workload, and promoting widespread adoption in clinical practice. The article also acknowledges the challenges associated with image variability and the potential impact on AI model performance, calling for further research and improvement in image quality and consistency.
oai:ojs.radap.kpi.ua:article/1963
2023-09-30T08:14:01Z
radiotechnique:biomedical-systems
v2
http://radap.kpi.ua/radiotechnique/article/view/1963
2023-09-30T08:14:01Z
N
No. 93 (2023); 70-77
Estimation of Multiple Cardiac Cells’ Action Potentials From Extracellular Field Potentials
Shpotak , M. O.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Ivanushkina , N. H.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Ivanko , K. O.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
Prokopenko , Y. V.; National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Kyiv, Ukraine
2023-09-30
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url:http://radap.kpi.ua/radiotechnique/article/view/1963
Modern biomedical technologies use a combination of microelectrode array (MEA) systems and artificially grown cells to study disease mechanisms and test drug effects. MEA systems measure extracellular field potentials (FPs) of cell cultures or tissues, but they cannot record intracellular action potentials (APs) without some modifications or additional devices, limiting the depth of electrophysiological analysis. One of the possible solutions to the inability of MEA systems to measure APs is to mathematically reconstruct them using recorded FPs. However, accurately reconstructing APs of multiple cells is challenging task, which is complicated by many factors such as the number of cells, synchronicity of their APs, identification of their electrophysiological parameters, and noise. This paper aims to address the mathematical problem of AP synchronicity, asynchronicity and partial synchronicity between multiple cells. In this study, mathematical techniques were employed to derive a system of equations capable of reconstructing the APs of N cells simultaneously, using the FPs recorded with N+1 electrodes. The equations take into account the number of cells, synchronicity and variation of their APs and specific electrical properties of the cells and the medium. In numerical experiments the equations were applied to reconstruct APs from FPs for cases with different types of synchronicity in noise-free and noisy conditions. The reconstructed APs, when combined with recorded FPs, expand the number of electrophysiological characteristics available for cardiotoxicity assessment in MEA systems.