Calculating the activating function of nerve excitation in inhomogeneous volume conductor during magnetic stimulation using the finite element method

Author

Liu, Ren ; Ueno, Shoogo

Author_Institution

Dept. of Biomed. Eng., Tokyo Univ., Japan

Volume

36

Issue

4

fYear

2000

fDate

7/1/2000 12:00:00 AM

Firstpage

1796

Lastpage

1799

Abstract

The first derivative of induced electric field during magnetic stimulation, activating function, is calculated to study the influence of the interface between conductors with different conductivities on nerve excitation. A Neumann type boundary condition is derived for applying the finite element method to calculate the induced electric field. The spatial distributions of induced electric fields and activating functions in homogeneous and inhomogeneous volume conductors are calculated for comparison. The results show that the interface between conductors of different conductivities appears to markedly affect the nerve excitation elicited by magnetic stimulation

Keywords

bioelectric phenomena; biological effects of fields; biomagnetism; finite element analysis; neurophysiology; Neumann type boundary condition; activating function; finite element method; homogeneous volume conductors; induced electric field; inhomogeneous volume conductor; inhomogeneous volume conductors; magnetic stimulation; magnetic stimulation, activating function; nerve excitation; spatial distributions; Boundary conditions; Coils; Conductivity; Conductors; Finite element methods; Humans; Magnetic stimulation; Neurophysiology; Nonuniform electric fields; Spatial resolution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.877792

Filename

877792