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Computing Lorentz forces generated by gradient coils in an open MRI system
Citation
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 Statement
Copyright © 2008 Australian Mathematical Society
Official URL: http://anziamj.austms.org.au
Abstract
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 |
| Downloads: | 0 |
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