Fariñas-Coronado W, Paz Z, Orta GJ, Rodrìguez-Denis E

Language: Spanish
References: 26
Page: 249-255
PDF size: 85.19 Kb.

ABSTRACT

Introduction. The study of the electrical properties of biological tissues dates from the nineteenth century. The development of this line of investigation and its clinical applications has increased recently due to the proved application of analysis of dielectric properties of biological tissues in this article, values of the dielectric dissipation factor are shown in terms of the frequency of a collection of samples of mammary tissue in both healthy and pathological conditions.
Material and methods. The electric properties of the samples which were considered, capacitance and conductance, were measured at an interval of frequency between 10 Hz and 10 MHz using a HP4192A impedance analyser in logarithmic mode and calibrated to compense for the parasitic loss, a product of the arrangement of electrodes. The signal used was 500 mVrms, considering a parallel RC model, a 6 decade frequency logarithmic sweep and a sweep made of data denominated AVERAGE available in the impedance analyser equipment. Acquisition was achieved automatically using software designed by CIB-UNEXPO with a Lab View 5.01 platform, called Z-Mammario Soft®.
Results and conclusions. A considerable difference in the dielectric dissipation factor was observed between healthy and pathologic tissue in the interval of frequency between 1 KHz and 1 MHz.

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