NDLI: Biomagnetic localization from transient quasi-static events

Content Provider	IEEE Xplore Digital Library
Author	Mosher, J.C. Leahy, R.M. Lewis, P.S.
Copyright Year	1993
Description	Author affiliation: Los Alamos Nat. Lab., NM, USA (Mosher, J.C.; Leahy, R.M.; Lewis, P.S.)
Abstract	Sensory stimuli, such as auditory, visual, or somatosensory, evoke neural responses in very localized regions of the brain. A SQUID biomagnetometer can measure the very weak fields that are generated outside of the head by this response. A simple source and head model of current dipoles inside a conducting sphere is typically used to interpret these magnetic field measurements or magnetoencephalograms (MEGs). Locating dipole sources using data recorded from an array of biomagnetic sensors is distinguished from conventional array source localization techniques by the quasi-static transient nature of the data. The basic MEG model is reviewed, and then a localization example is given to show the need for partitioning the data to improve estimator performance. Time-eigenspectrum analysis is introduced as a means of partitioning and interpreting spatio-temporal biomagnetic data. Examples using both simulated and somatosensory data are presented.<>
Starting Page	91
Ending Page	94
File Size	457580
Page Count	4
File Format	PDF
ISBN	0780374029
ISSN	15206149
DOI	10.1109/ICASSP.1993.319062
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-04-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Biomagnetics Magnetic heads Magnetic field measurement Sensor arrays SQUIDs Laboratories Signal processing Image processing Superconducting magnets Inverse problems
Content Type	Text
Resource Type	Article

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