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An Analytical Approach to the Design of Quiet Cylindrical Asymmetric Gradient Coils in MRI


Forbes, LK and Brideson, MA and Crozier, S and While, PT, An Analytical Approach to the Design of Quiet Cylindrical Asymmetric Gradient Coils in MRI, Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering, 31B, (4) pp. 218-236. ISSN 1552-5031 (2007) [Refereed Article]

DOI: doi:10.1002/cmr.b.20095


We consider the design of asymmetric gradient coils in a conventional cylindrical bore magnetic resonance imaging system. The gradient coils are switched on and off during the scan, and are therefore subject to Lorentz forces that cause them to buckle during the switching process. This in turn creates a pressure wave within the coil, and that gives rise to acoustic noise. We present a simplified linearized model for the deflection of the coil due to electromagnetic forces, which is amenable to solution using analytical methods. Closed-form solutions for the coil deflection and the pressure pulse and noise level within the coil are obtained. These are used to design new coil winding patterns so as to reduce the acoustic noise. Sample results are shown both for unshielded and shielded gradient coils. Extensions of this model are indicated, although it is suggested that the advantages of the present closed-form solutions might then not be available, and fully numerical solutions may be needed instead. © 2007 Wiley Periodicals, Inc.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Medical and biological physics
Research Field:Medical physics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Forbes, LK (Professor Larry Forbes)
UTAS Author:Brideson, MA (Dr Michael Brideson)
UTAS Author:While, PT (Dr Peter While)
ID Code:49088
Year Published:2007
Funding Support:Australian Research Council (DP0343350)
Web of Science® Times Cited:14
Deposited By:Mathematics
Deposited On:2007-08-01
Last Modified:2008-04-04

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