| Finite element analysis of gradient z-coil induced eddy currents in a permanent MRI magnet. | |
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MedLine Citation:
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PMID: 21106418 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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In permanent magnetic resonance imaging (MRI) systems, pulsed gradient fields induce strong eddy currents in the conducting structures of the magnet body. The gradient field for image encoding is perturbed by these eddy currents leading to MR image distortions. This paper presents a comprehensive finite element (FE) analysis of the eddy current generation in the magnet conductors. In the proposed FE model, the hysteretic characteristics of ferromagnetic materials are considered and a scalar Preisach hysteresis model is employed. The developed FE model was applied to study gradient z-coil induced eddy currents in a 0.5 T permanent MRI device. The simulation results demonstrate that the approach could be effectively used to investigate eddy current problems involving ferromagnetic materials. With the knowledge gained from this eddy current model, our next step is to design a passive magnet structure and active gradient coils to reduce the eddy current effects. |
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Authors:
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Xia Li; Ling Xia; Wufan Chen; Feng Liu; Stuart Crozier; Dexin Xie |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-11-04 |
Journal Detail:
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Title: Journal of magnetic resonance (San Diego, Calif. : 1997) Volume: 208 ISSN: 1096-0856 ISO Abbreviation: J. Magn. Reson. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9707935 Medline TA: J Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 148-55 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, China. xialing@zju.edu.cn |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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