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Calculating the movement of MRI coils, and minimizing their noise

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Forbes, LK and Brideson, MA and Crozier, S and While, PT (2007) Calculating the movement of MRI coils, and minimizing their noise. ANZIAM Journal, 49. C17-C35. ISSN 1446-1811

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Abstract

The design of gradient coils within Magnetic Resonance Imaging equipment is considered. These coils produce linear magnetic fields in each of the three orthogonal directions in physical space. In addition, they are turned on and off repeatedly to enhance the clarity of the image, but this produces a great deal of noise within the coil, as its shape distorts under the influence of Lorentz forces. We present a method for calculating the movement of the coil in the background magnetic field, and estimating the consequent noise levels. This involves solving for the current density in the coil coupled with equations for its elastic deformation, along with acoustic equations for the pressure in the surrounding air. Winding patterns are designed to minimize the noise produced by the Magnetic Resonance Imaging coil.

Item Type: Article
Journal or Publication Title: ANZIAM Journal
Publisher: Australian Mathematics Publ Assoc Inc
Page Range: C17-C35
ISSN: 1446-1811
Date Deposited: 07 Apr 2008 14:28
Last Modified: 18 Nov 2014 03:34
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