Authors : G.K. Aleksanyan, A.I. Kucher and I.D. Shcherbakov
Abstract: The study is focused on development of computer finite element model of human chest using Femm and Octave S. The model has the geometry of an average person and takes into account the change in the conductivity and permittivity of biological tissues with increasing frequency of the injection current. The model allows the calculation of the value of the complex amplitude of the potential at any point of the object. A computational experiment, simulating the process of obtaining measurement data for electrical impedance tomography is described. An example of the simulation results and graphs of the complex amplitude of potentials on the surface of the object is considered. Using the method of multi-frequency electrical impedance tomography, BO structure with breathing and heart rate at different frequencies of the injected current was reconstructed. It was found that in the study of the internal structure of BO by EIT complex amplitude of the potential must be measured that allows to reconstruct the changes in both the real and imaginary parts of the complex conductivity BO carrying useful information. The results of these studies have shown that the method of multi-frequency EIT is an effective tool for visualization of the internal structures of BO and for monitoring and evaluation of dynamic (physiological) processes occurring in the BO. It is shown that it is possible to visualize the processes of respiration and heart rate using a different injected current frequency.
G.K. Aleksanyan, A.I. Kucher and I.D. Shcherbakov, 2017. Research of the Multi-Frequency Electrical Impedance Tomography using Possibility for Specific Physiological Processes Monitoring Tasks. Journal of Engineering and Applied Sciences, 12: 4251-4258.