G.K.  Aleksanyan, A.I.  Kucher, I.D.  Shcherbakov, 
    Research of the Multi-Frequency Electrical Impedance Tomography using
Possibility for Specific Physiological Processes Monitoring Tasks,
    Journal of Engineering and Applied Sciences,
    Volume 12,Issue 16,
    2017,
    Pages 4251-4258,
    ISSN 1816-949x,
    jeasci.2017.4251.4258,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2017.4251.4258)
    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.
    Keywords: Multi-frequency electrical impedance tomography;the model;;the direct problem;inverse problem;conductivity;dielectric constant and the heartbeat process;the process of breathing