Annals of Biomedical Engineering

, Volume 24, Issue 5, pp 606–616

Magnetic stimulation of the nervous system: Induced electric field in unbounded, semi-infinite, spherical, and cylindrical media

  • Paolo Ravazzani
  • Jarmo Ruohonen
  • Ferdinando Grandori
  • Gabriella Tognola
Article

DOI: 10.1007/BF02684229

Cite this article as:
Ravazzani, P., Ruohonen, J., Grandori, F. et al. Ann Biomed Eng (1996) 24: 606. doi:10.1007/BF02684229

Abstract

Knowledge of the electric field that is induced in the brain or the limbs is of importance in magnetic stimulation of the nervous system. Here, an analytical model based on the reciprocity theorem is used to compare the induced electric field in unbounded, semi-infinite, spherical, and cylinder-like volume conductors. Typical stimulation coil arrangements are considered, including the double coil and various orientations of the single coil. The results can be used to determine when the influence of the boundaries is negligible enough to allow the use of more simplified geometries.

Keywords

Reciprocity theoremCortical and peripheral magnetic stimulationBoundary effectsMedium geometryElectric field

Copyright information

© Biomedical Engineering Society 1996

Authors and Affiliations

  • Paolo Ravazzani
    • 1
  • Jarmo Ruohonen
    • 2
  • Ferdinando Grandori
    • 1
  • Gabriella Tognola
    • 1
  1. 1.System Theory Center (CNR), Department of Biomedical EngineeringPolytechnic of MilanMilanItaly
  2. 2.BioMag Laboratory, Medical Engineering CentreHelsinki University Central HospitalHelsinkiFinland