Microwave Properties of Fresh Mammalian Brain Tissues at Body Temperature

The complex dielectric constant of human, primate, canine, ovine, and swine brain tissues at 37°C was measured in S band using a slotted waveguide section. The in vitro measurements indicate that mammalian brains exhibit very little dispersion within the frequency range of 2.25 to 3.95 GHz. The dielectric constant was found between 30 and 35 and the conductivity varied from 1.1 to 3.1 mho/m.