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Proceedings Paper

Analytic solution of eddy currents and its temporal compensation in nuclear magnetic resonance imaging
Author(s): Chang Beom Ahn; Zang-Hee Cho
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Paper Abstract

An analytic solution of the eddy currents in nuclear magnetic resonance imaging is derived from Maxwell's equations and a temporal compensation technique for the recovery of distorted gradient waveform is described. The analysis is mainly focused on the frequency characteristics and the intensity variations of the eddy-current induced field depending on the system geometry. The major effects of eddy currents in NMR imaging appeared as (i) resolution degradation, (ii) misregisteration, (iii) intensity attenuation, and (iv) phase variation. Since the proposed approach is based on the analytic solution rather than experimentally determined multiexponential models as previously tried, accurate compensation can be achieved effectively. The limitation of the the temporal compensation due to the spatially-varying characteristics of eddy currents is also investigated.

Paper Details

Date Published: 1 July 1990
PDF: 12 pages
Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); doi: 10.1117/12.18791
Show Author Affiliations
Chang Beom Ahn, Univ. of California/Irvine (United States)
Zang-Hee Cho, Univ. of California/Irvine and Korea Advanced Institute of Science (United States)

Published in SPIE Proceedings Vol. 1231:
Medical Imaging IV: Image Formation
Roger H. Schneider, Editor(s)

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