Induced electromagnetic fields in conducting bodies irradiated by magnetic fields and microwaves

A theoretical method for determining the eddy current induced by a uniform RF magnetic field or a beam of RF magnetic field in a biological body is developed. The body of rotational symmetry is subdivided into a number of circular rings with various radii and cross sectional areas. The eddy current induced by the impressed magnetic field is considered, physically, as induced by a circulatory impressed electric field associated with the uniform impressed magnetic field. The eddy current is the product of the complex conductivity and the induced electric field. Using these relations and the point matching method, a set of simultaneous equations for the induced electric fields is obtained. A numerical method for quantifying the induced EM field on the surface of an irradiated biological body based on two coupled, surface integral equations is also developed.