Complex dielectric permittivity of animals' organs and tissues. Measurements in microwave band for the needs of modern veterinary medicine

Abstract

The method of electromagnetic (EM) hyperthermia, being successfully applicable mainly in oncology and physiotherapy until now, has begun to be used in modern veterinary medicine for treating some widespread noncontagious diseases and suppressing the animals' reproductive functions. But for this it is necessary to have knowledge about the dielectric properties of the animals' tissues and organs in the frequency band 0.433-10 GHz. Because the data in the literature are not sufficient, in this work some of these dielectric properties were measured at 2.45 GHz frequency by the Wei-Sridhar technique. The technique's merits are its suitableness for in vitro and in vivo measurements in the whole coaxial line frequency band with good precision and simplicity. This method is based on measuring the complex reflection coefficients from four specimens: the sample under test and three for calibration. The measured tissue samples (muscle, fat) and animal organs (liver, kidney, spleen, brain, lung, testes, udder) were partially obtained from a Zooveterinary institute and partially were bought on the market. The measurements of the dielectric constants were carried out using fresh cuts.