The analytical solution of EIT forward problem based on a multilayer spherical model

A 4-layers sphere model of human head was used to simulate human head. From outside to inside, the layers denoted scalp, skull, CFS and cerebra, respectively. The point current source placed on the outmost layer was regarded as the boundary condition, and the method of separation of variables was used to solve the electrical potential distributions in all layers. The electrical potential and the current distributions expressions were given and the equi-potential line maps and current lines were drawn in this article. The simulation result can be used to analyze the head EIT problems.