Analytic solution of eddy currents and its temporal compensation in nuclear magnetic resonance imaging

Chang Beom Ahn; Zang-Hee Cho

doi:10.1117/12.18791

1 July 1990 Analytic solution of eddy currents and its temporal compensation in nuclear magnetic resonance imaging

Chang Beom Ahn, Zang-Hee Cho

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18791
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

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.

Citation Download Citation

Chang Beom Ahn and Zang-Hee Cho "Analytic solution of eddy currents and its temporal compensation in nuclear magnetic resonance imaging", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18791

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