MECHANICAL IMPEDANCE
OF BIOLOGICAL SOFT TISSUES

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Measuring means
Experimental study
Spectral measurements
Single-frequency measurements
Physical models
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E-mail: eugene@appl.sci-nnov.ru
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Radiophysics in medicine
IAP RAS

SPECTRAL MEASUREMENTS

In the course of classical experimental studies, performed in connection with the problem of different contact sensors matching with the human body surface, the frequency dependencies of impedance characteristics were studied and their changes when changing an indentor diameter and indentor pressure on the tissue. Probably, on tradition to study a tissue condition the measurements of impedance characteristics were also performed, and are performing, mainly by such "spectral measurements". Such a method was realized as well in IAP RAS in 1986 on the basis of the equipment of the Bruel & Kjer firm. A series of experimental and theoretical works was performed on its basis studying a process of interaction of vibrating indentor with biological tissues. Besides, the studies of impedance characteristics (and rheological parameters determined from them) of human body surface soft tissues in different conditions (relaxation, stress, edema) were performed, as well of rabbit tissues samples. Not so long ago the hardware-software complex was created on the basis of this experimental tool allowing to obtain the impedance characteristics spectra in electronic form. That opens new opportunities of experimental studies and provides the data obtaining for reconstruction of the mechano-acoustical model of tissue, taking its layered construction into account.