Jaakko Malmivuo

in Bioelectromagnetism

Published in print October 1995 | ISBN: 9780195058239
Published online March 2012 | e-ISBN: 9780199847839 | DOI:

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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

Chapter.  3530 words.  Illustrated.

Subjects: Neuroscience

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