Scattering from biological tissue using the SCN transmission line matrix method

In this paper the application of the symmetric condensed node transmission line matrix method (SCN TLM) to three dimensional scattering from biological tissue is investigated. Using a simplified model of the human head and assuming a nondispersive nature of biological tissue, the stub-loaded SCN TLM method is used to obtain scattered and transmitted fields data and the SAR distribution. To simulate the dispersive nature of biological tissue, first order Debye approximation of the permittivity in the frequency domain is used. A modified TLM technique is used. In this technique the scattering matrix is independent of the dielectric properties of the medium, which are accounted for via lumped equivalent networks or sources connected to the nodes. These equivalent sources are calculated at each time step and included in the scattering procedure of the TLM. The results of both cases are compared.