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Calculating Temperature Distributions for Gradient Coils

Citation

While, PT and Forbes, LK and Crozier, S, Calculating Temperature Distributions for Gradient Coils, Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering, 37B, (3) pp. 146-159. ISSN 1552-5031 (2010) [Refereed Article]


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The definitive published version is available online at: http://interscience.wiley.com

DOI: doi:10.1002/cmr.b.20163

Abstract

Abstract: The operation of gradient coils typically requires large currents to be driven in resistive copper wires. A major problem in gradient coil design is therefore the correspondingly large Ohmic heating that results, which can severely impact image quality or lead to system failure. Of particular concern is the location and extent of temperature hot spots in the coil system. In this article, a model is presented for predicting the spatial temperature distribution of a gradient coil. The model includes axial and azimuthal dissipation of heat via conduction throughout a copper layer, radial conduction of heat through an insulating former, and radial convection and radiation to the environment. Two steady-state solutions for the temperature distribution are presented, involving Green's functions and Fourier series. In addition, an approximate time-dependent solution is sought describing the hot spot temperature as a function of time, which demonstrates that the steady-state solutions are likely to be reached within a typical scanning scenario. The impact on the temperature distribution of a great number of coil properties may be investigated using the model and examples are given for different coil geometries, thermal material properties, and cooling mechanisms, such as convective air, forced air, and forced water cooling. (C) 2010 Wiley Periodicals, Inc. Concepts Magn Reson Part B (Magn Reson Engineering) 37B: 146-159, 2010

Item Details

Item Type:Refereed Article
Keywords:magnetic resonance imaging; gradient coils; temperature; heating; cooling;thermal; hot spot
Research Division:Physical Sciences
Research Group:Other Physical Sciences
Research Field:Medical Physics
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:64917
Year Published:2010
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2010-09-15
Last Modified:2011-03-23
Downloads:3 View Download Statistics

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