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Proceedings Paper

Sensitivity Correction In Surface Coil MR Imaging
Author(s): P. Duffy Cutler; Nicholas J. Mankovich
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Paper Abstract

A sensitivity correction for a single turn receiver coil used to image a human knee is discussed. The coil consists of single band of copper conductor circling a plastic leg form and the patient's knee. While the excitation can be considered reasonably uniform across the field of view, the detection of the decaying MR signal by the single-turn solenoidal reciever coil is very non-uniform, falling off rapidly away from the copper conductor. We have modeled the sensitivity function of this coil as equivalent to that of a single-turn circular antenna with a known radius. A correction for this sensitivity variation may be approximated numerically and applied to the image in a post-processing manner. By a combination of qualitative and quantitative measures, the efficacy of this 'current-loop' correction scheme is measured by evaluating the uniformity of NiCl2 phantom images. A technique for applying this correction to clinical images of the knee is also discussed.

Paper Details

Date Published: 25 May 1989
PDF: 5 pages
Proc. SPIE 1092, Medical Imaging III: Image Processing, (25 May 1989); doi: 10.1117/12.953292
Show Author Affiliations
P. Duffy Cutler, University of California (United States)
Nicholas J. Mankovich, University of California (United States)

Published in SPIE Proceedings Vol. 1092:
Medical Imaging III: Image Processing
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)

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