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Computing Lorentz forces generated by gradient coils in an open MRI system


Brideson, MA and Jackson, JM and Forbes, LK and Crozier, S, Computing Lorentz forces generated by gradient coils in an open MRI system, ANZIAM Journal, 49 pp. C423-C438. ISSN 1446-1811 (2008) [Refereed Article]

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Copyright 2008 Australian Mathematical Society

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Magnetic Resonance Imaging requires the use of gradient coils to perturb the main homogeneous static magnetic field. Sequential perturbations in each of the orthogonal cartesian directions results in the magnetic field becoming spatially encoded. The fast switching of the gradient coils produces large Lorentz forces which act on the coils. These unwanted forces dissipate as acoustic noise at sound pressure levels upward of 130dB. We present a method for designing open magnetic resonance imaging coils that produce reduced Lorentz forces whilst still producing highly accurate gradient fields. We show that when gradient fields of approximately 1% are considered, a linearised regularisation solves for the Fourier series coefficients.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Biomedical engineering
Research Field:Biomedical instrumentation
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Brideson, MA (Dr Michael Brideson)
UTAS Author:Jackson, JM (Mr James Jackson)
UTAS Author:Forbes, LK (Professor Larry Forbes)
ID Code:51531
Year Published:2008
Deposited By:Mathematics
Deposited On:2008-04-02
Last Modified:2015-02-08

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