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Designing gradient coils with reduced hot spot temperatures

Citation

While, PT and Forbes, LK and Crozier, S, Designing gradient coils with reduced hot spot temperatures, Journal of Magnetic Resonance, 203, (1) pp. 91-99. ISSN 1090-7807 (2010) [Refereed Article]


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DOI: doi:10.1016/j.jmr.2009.12.004

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.

Item Details

Item Type:Refereed Article
Keywords:magnetic resonance imaging, MRI, gradient coil design, temperature, heating, cooling, thermal, hot spot, inverse method, optimisation, non-linear
Research Division:Engineering
Research Group:Biomedical Engineering
Research Field:Biomedical Instrumentation
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:While, PT (Dr Peter While)
Author:Forbes, LK (Professor Larry Forbes)
ID Code:63629
Year Published:2010
Web of Science® Times Cited:11
Deposited By:Mathematics
Deposited On:2010-05-19
Last Modified:2015-01-27
Downloads:8 View Download Statistics

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