Finite element analysis of gradient z-coil induced eddy currents in a permanent MRI magnet

Li, Xia, Xia, Ling, Chen, Wufan, Liu, Feng, Crozier, Stuart and Xie, Dexin (2011) Finite element analysis of gradient z-coil induced eddy currents in a permanent MRI magnet. Journal of Magnetic Resonance, 208 1: 148-155. doi:10.1016/j.jmr.2010.10.017


Author Li, Xia
Xia, Ling
Chen, Wufan
Liu, Feng
Crozier, Stuart
Xie, Dexin
Title Finite element analysis of gradient z-coil induced eddy currents in a permanent MRI magnet
Formatted title
Finite element analysis of gradient z-coil induced eddy currents in a permanent MRI magnet
Journal name Journal of Magnetic Resonance   Check publisher's open access policy
ISSN 1090-7807
1096-0856
Publication date 2011-01-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.jmr.2010.10.017
Volume 208
Issue 1
Start page 148
End page 155
Total pages 8
Place of publication Maryland Heights, MO, U.S.A.
Publisher Academic Press
Collection year 2012
Language eng
Formatted abstract
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.
Keyword Permanent magnet MRI
Eddy currents
Finite element analysis
Ferromagnetic materials
Preisach model
Numerical-analysis
Preisach theory
Minor loop
Hysteresis
Design
Formulation
Account
Model
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 4 November 2010.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Information Technology and Electrical Engineering Publications
 
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Created: Sun, 27 Feb 2011, 10:05:58 EST