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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 |
| UTAS Author: | While, PT (Dr Peter While) |
| UTAS Author: | Forbes, LK (Professor Larry Forbes) |
| ID Code: | 63629 |
| Year Published: | 2010 |
| Web of Science® Times Cited: | 13 |
| Deposited By: | Mathematics |
| Deposited On: | 2010-05-19 |
| Last Modified: | 2015-01-27 |
| Downloads: | 8 View Download Statistics |
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