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BioelectromagnetismPrinciples and Applications of Bioelectric and Biomagnetic Fields$
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Jaakko Malmivuo and Robert Plonsey

Print publication date: 1995

Print ISBN-13: 9780195058239

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780195058239.001.0001

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(p.265) Chapter 14 Magnetoencephalography

Jaakko Malmivuo

Oxford University Press

In electroencephalography the head is modeled with concentric spheres. This model is valid and important also in magnetoencephalography. Because of the low signal level of MEG, the measurements are usually made as close to the head as possible. Since sensitivity decreases rapidly with distance, and since the detector coil radius is small compared to the dimensions of the head, the head can be successfully modeled as a half-space. This holds also for multichannel MEG-detectors, because the detectors are usually placed on a spherical surface, concentric with the head.

Keywords:   magnetoencephalography, concentric spheres, half-space, MEG-detectors, single-coil magnetometer, gradiometer

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