Electric fields induced in magnetic stimulation of the nervous system. Influence of volume conductor boundaries

Author

Ravazzani, P. ; Ruohonen, J. ; Grandori, F.

Author_Institution

Dept. of Biomed. Eng., Politecnico di Milano, Italy

fYear

1994

fDate

3-6 Nov 1994

Firstpage

325

Abstract

Knowledge of the electric fields that are induced inside the brain and the limbs is of importance in magnetic stimulation of the nervous system. Here, an analytical model based on the reciprocity theorem is applied to compare the induced fields in unbounded and semi-infinite media, sphere and cylinder-like prolate spheroids. Typical stimulating coil arrangements are considered, including butterfly coil and different orientations of a single coil. The results can be used to determine when the influence of the boundaries is negligible and simplified geometries can be used

Keywords

bioelectric phenomena; biological effects of fields; biomagnetism; brain models; coils; electric fields; electromagnetic induction; muscle; neurophysiology; analytical model; brain; butterfly coil an; cylinder-like prolate spheroids; electric fields; limbs; magnetic stimulation; nervous system; reciprocity theorem; semi-infinite media; simplified geometries; single coil; sphere; stimulating coil arrangements; unbounded media; volume conductor boundaries; Analytical models; Biomagnetics; Biomedical engineering; Coils; Computational geometry; Conductors; Geometry; Magnetic analysis; Magnetic stimulation; Nervous system; Solid modeling;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1994. Engineering Advances: New Opportunities for Biomedical Engineers. Proceedings of the 16th Annual International Conference of the IEEE

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2050-6

Type

conf

DOI

10.1109/IEMBS.1994.412022

Filename

412022