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Minimizing Hot Spot Temperature in Asymmetric Gradient Coil Design
Citation
While, PT and Forbes, LK and Crozier, S, Minimizing Hot Spot Temperature in Asymmetric Gradient Coil Design, IEEE Transactions on Biomedical Engineering, 58, (8) pp. 2418-2425. ISSN 0018-9294 (2011) [Refereed Article]
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Copyright Statement
Copyright 2011 IEEE
DOI: doi:10.1109/TBME.2011.2159503
Abstract
Heating caused by gradient coils is a considerable concern in the operation of MRI scanners. Hot spots can occur in regions where the gradient coil windings are closely spaced. These problem areas are particularly common in the design of gradient coils with asymmetrically located target regions. In this paper, an extension of an existing coil design method is described, to enable the design of asymmetric gradient coils with reduced hot spot temperatures. An improved model is presented for predicting steady-state spatial temperature distributions for gradient coils. A great amount of flexibility is afforded by this model to consider a wide range of geometries and system material properties. A feature of the temperature distribution related to the temperature gradient is used in a relaxed fixed point iteration routine for successively altering coil windings to have a lower hot spot temperature. Results show that significant reductions in peak temperature are possible at little or no cost to coil performance when compared to minimum power coils of equivalent field error.
Item Details
Item Type: | Refereed Article |
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Keywords: | Cooling , MRI , gradient coil design , heating , hot spot , inverse method , nonlinear optimization , temperature , thermal |
Research Division: | Mathematical Sciences |
Research Group: | Numerical and computational mathematics |
Research Field: | Optimisation |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in engineering |
UTAS Author: | While, PT (Dr Peter While) |
UTAS Author: | Forbes, LK (Professor Larry Forbes) |
ID Code: | 73423 |
Year Published: | 2011 |
Web of Science® Times Cited: | 6 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2011-10-05 |
Last Modified: | 2012-04-17 |
Downloads: | 0 |
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