磁気刺激における不均質体積導体中の誘起電場と活動関数の算出

抄録

A calculation model is proposed for the induced electric fields and the activating function in inhomogeneous volume conductors during magnetic stimulation. On the basis of the proposed model, the finite element method (FEM) is used to perform numeric calculation for the induced electric fields in an inhomogeneous volume conductor. In order to study the influence of inhomogeneities on nerve excitation, the spatial distribution of the activating function was also calculated. In a comparison of the results with a homogeneous case, the interface between conductors of different conductivities appears to affect markedly the nerve excitation elicited by magnetic stimulation. Theoretical explanations are given for this simulation result.