Effects of inhomogeneities in cerebral modeling for magnetoence phalography

S. Ueno, K. Iramina, K. Harada

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Abstract

A current dipole, which is located in a homogeneous sphere and orients radially, produces no magnetic fields outside the sphere. This theory of null-field is widely used in understanding the magneto-encephalography In the present report, effects of inhomogeneities in the head on the surface magnetic fields which are produced by radially oriented dipoles are investigated. It is shown that normal components of magnetic fields perpendicular to the surface of the sphere generated by radial dipoles are determined by volume currents. The flow patterns of volume currents are strongly affected by local inhomogeneities inside the body when the primary current source is located near the boundaries of inhomogeneous regions.

Original languageEnglish
Pages (from-to)3753-3755
Number of pages3
JournalIEEE Transactions on Magnetics
Volume23
Issue number5
DOIs
Publication statusPublished - Sep 1987

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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