Abstract
Abstract We revisit simple calculations of spherical arrays of radial magnetometers, axial gradiometers and combined radial magnetometers/planar gradiometers in the presence of the noise generated by a spherical model brain and typical levels of external interference. We find that array information is not a useful way to distinguish these MEG systems. Investigations of source localization applying the maximum likelihood fitting function and the noise in beamformed signals show that for arrays with > 130 SQUIDs, very nearly the same theoretical performance is expected from all geometries of SQUID pickup loops.
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