Designing gradient coils with reduced hot spot temperatures

While, Peter T., Forbes, Larry K. and Crozier, Stuart (2010) Designing gradient coils with reduced hot spot temperatures. Journal of Magnetic Resonance, 203 1: 91-99. doi:10.1016/j.jmr.2009.12.004

Author While, Peter T.
Forbes, Larry K.
Crozier, Stuart
Title Designing gradient coils with reduced hot spot temperatures
Journal name Journal of Magnetic Resonance   Check publisher's open access policy
ISSN 1090-7807
Publication date 2010-03
Sub-type Article (original research)
DOI 10.1016/j.jmr.2009.12.004
Volume 203
Issue 1
Start page 91
End page 99
Total pages 9
Place of publication Oxford, UK
Publisher Elsevier
Collection year 2011
Language eng
Subject 0906 Electrical and Electronic Engineering
Abstract Gradient coil temperature is an important concern in the design and construction of MRI scanners. Closely spaced gradient coil windings cause temperature hot spots within the system as a result of Ohmic heating associated with large current being driven through resistive material, and can strongly affect the performance of the coils. In this paper, a model is presented for predicting the spatial temperature distribution of a gradient coil, including the location and extent of temperature hot spots. Subsequently, a method is described for designing gradient coils with improved temperature distributions and reduced hot spot temperatures. Maximum temperature represents a non-linear constraint and a relaxed fixed point iteration routine is proposed to adjust coil windings iteratively to minimise this coil feature. Several examples are considered that assume different thermal material properties and cooling mechanisms for the gradient system. Coil winding solutions are obtained for all cases considered that display a considerable drop in hot spot temperature (>20%) when compared to standard minimum power gradient coils with equivalent gradient homogeneity, efficiency and inductance. The method is semi-analytical in nature and can be adapted easily to consider other non-linear constraints in the design of gradient coils or similar systems.
Keyword Magnetic resonance imaging (MRI)
Gradient coil design
Hot spot
Inverse method
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Information Technology and Electrical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 10 times in Thomson Reuters Web of Science Article | Citations
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Created: Sun, 14 Mar 2010, 00:03:02 EST