NDLI: SQUID arrays for simultaneous magnetic measurements: calibration and source localization performance

Content Provider	IEEE Xplore Digital Library
Author	Ribeiro, P.C. Williamson, S.J. Kaufman, L.
Copyright Year	1964
Abstract	Recently developed small arrays of SQUID- (superconducting quantum interference device) based magnetic sensors can, if appropriately placed, locate the position of a confined biomagnetic source without moving the array. A technique is presented having a relative accuracy of about 2% for calibrating such sensors having detection coils with the geometry of a second-order gradiometer. The effects of calibration error and magnetic noise on the accuracy of locating an equivalent current dipole source in the human brain are investigated for five- and seven-sensor probes and for a pair of seven-sensor probes. With a noise level of 5% of peak signal, uncertainties of about 20% in source strength and depth for a five-sensor probe are reduced to 8% for a pair of seven-sensor probes, and uncertainties of about 15 mm in lateral position are reduced to 1 mm for the configuration considered.<>
Sponsorship	IEEE Engineering in Medicine and Biology Society
Page Count	10
File Size	1167471
Starting Page	551
Ending Page	560
File Format	PDF
ISSN	00189294
Volume Number	35
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	SQUIDs Magnetic variables measurement Calibration Sensor arrays Probes Superconducting coils Magnetic sensors Uncertainty Superconducting devices Interference
Content Type	Text
Resource Type	Article
Subject	Biomedical Engineering

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