Propagation and Absorption in Tissue Media

摘要: The propagation of electromagnetic waves in biological materials is governed by the dielectric constant, conductivity, source configuration, and geometrical factors that describe tissue structure. These parameters also determine quantity energy a given body extracts from propagating wave. When radius curvature surface large compared to wavelength beam width impinging radiation, planar models may be used estimate absorbed its distribution inside body. Otherwise, will dictated size body, surface, ratio wavelength, characteristics.