Antoniuk O. Improvement of methods and means of impedancemetry for study of human body tissues

Thesis is devoted to improvement of the technical component of metrological assurance of immitance approach to study human body tissues. Ways of localization of impedance measurement of human body tissue areas that allow measuring impedance of tissues of specified size are suggested. Mathematical models of the methodological measurement errors for evaluation of equivalent electrical circuit informative parameters of human body tissues were considered. It is shown that reactive component takes an extreme value in the range of low frequencies; herewith frequency depends on electrode impedance parameters. It may be used for identification of biological tissues considering area of current electrodes, their form and contact resistance, because by this the electrode impedance is determined. The structure of measuring converter "impedance-voltage" of measuring impedance components of biological tissues with using of five electrode sensor, that ensure result invariance to no informative impedances are suggested.