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Minimum maximum temperature gradient coil design

Citation

While, PT and Poole, MS and Forbes, LK and Crozier, S, Minimum maximum temperature gradient coil design, Magnetic Resonance in Medicine, 70, (2) pp. 584-594. ISSN 0740-3194 (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Wiley Periodicals.

DOI: doi:10.1002/mrm.24492

Abstract

Ohmic heating is a serious problem in gradient coil operation. A method is presented for redesigning cylindrical gradient coils to operate at minimum peak temperature, while maintaining field homogeneity and coil performance. To generate these minimaxT coil windings, an existing analytic method for simulating the spatial temperature distribution of single layer gradient coils is combined with a minimax optimization routine based on sequential quadratic programming. Simulations are provided for symmetric and asymmetric gradient coils that show considerable improvements in reducing maximum temperature over existing methods. The winding patterns of the minimaxT coils were found to be heavily dependent on the assumed thermal material properties and generally display an interesting "fish-eye" spreading of windings in the dense regions of the coil. Small prototype coils were constructed and tested for experimental validation and these demonstrate that with a reasonable estimate of material properties, thermal performance can be improved considerably with negligible change to the field error or standard figures of merit.

Item Details

Item Type:Refereed Article
Keywords:gradient coil design; temperature; heating; thermal performance; minimax optimization
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
Author:While, PT (Dr Peter While)
Author:Forbes, LK (Professor Larry Forbes)
ID Code:86257
Year Published:2013
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2013-09-02
Last Modified:2017-10-30
Downloads:0

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