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Proceedings Paper

Evaluation Of Algorithms For A Squid Detector Neuromagnetic Imaging System
Author(s): Richard Leahy; Brian Jeffe; Manbir Singh; Ricardo Brechner
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Paper Abstract

The SQUID based biomagnetometer has been widely used to measure the external magnetic field produced by neural activity. In this paper we consider the viability of using this data to reconstruct three dimensional neuromagnetic images (NMI) of an equivalent electrical current distribution within the brain which would produce the measured magnetic field. The fundamental limitations on this mode of imaging are evaluated and possible physical models and mathematical formulations of the problem are proposed. Several algorithms often used in medical image reconstruction are applied to the problem and their performance evaluated. We conclude that the reconstruction problem is highly ill-posed, and that conventional image reconstruction algorithms are inadequate for 3-D NMI. A class of solutions we call 'minimum dipole' is shown to provide more accurate reconstructions of simple current distributions.

Paper Details

Date Published: 1 January 1987
PDF: 6 pages
Proc. SPIE 0767, Medical Imaging, (1 January 1987); doi: 10.1117/12.966974
Show Author Affiliations
Richard Leahy, University of Southern California (United States)
Brian Jeffe, Hughes Aircraft Company (United States)
Manbir Singh, University of Southern California (United States)
Ricardo Brechner, University of Southern California (United States)

Published in SPIE Proceedings Vol. 0767:
Medical Imaging
Samuel J. Dwyer; Roger H. Schneider, Editor(s)

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