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Proceedings Paper

Limitations On Biomagnetic Imaging
Author(s): Robert E. Alvarez
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Paper Abstract

The effects of thermal radiation and quantum detector noise on biomagnetic imaging are discussed. The thermal noise due to the reception of blackbody radiation by the magnetometer sensing coil is described. Quantum limits on detector performance are calculated by first deriving the noise in a SQUID magnetometer based on a small signal circuit model. The quantum limits of SQUID noise are then applied to the noise model. The results of the calculations show that thermal radiation noise is negligible compared to quantum noise which, in turn, is about a factor of 50 less than the minimum biomagnetic fields now measurable. The models also show that the noise depends on the effective volume of the pickup coil and the relationship of imaging resolution to pickup coil geometry is described.

Paper Details

Date Published: 27 June 1988
PDF: 8 pages
Proc. SPIE 0914, Medical Imaging II, (27 June 1988); doi: 10.1117/12.968609
Show Author Affiliations
Robert E. Alvarez, Aprend Technology (United States)

Published in SPIE Proceedings Vol. 0914:
Medical Imaging II
Samuel J. Dwyer III; Roger H. Schneider; Samuel J. Dwyer III; Roger H. Schneider; Roger H. Schneider; Samuel J. Dwyer III, Editor(s)

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