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3D gradient coil design for open MRI systems
Citation
While, PT and Forbes, LK and Crozier, S, 3D gradient coil design for open MRI systems, Journal of Magnetic Resonance, 207, (1) pp. 124-133. ISSN 1090-7807 (2010) [Refereed Article]
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DOI: doi:10.1016/j.jmr.2010.08.017
Abstract
Existing gradient coil design methods typically require some predetermined surface to be specified upon
which the precise locations of coil windings are optimised with respect to gradient homogeneity and
other measures of coil performance. In contrast, in this paper an analytic inverse method is presented
for the theoretical design of 3D gradient coils in which the precise 3D geometry of the coils is obtained
as part of the optimisation process. This method has been described previously for cylindrical wholebody
gradients and is extended here for open MRI systems. A 3D current density solution is obtained
using Fourier series combined with Tikhonov regularisation. The examples presented involve a minimum
power penalty function and an optional shielding constraint. A discretised set of 3D coil windings is
obtained using an equi-flux streamline seeding method. Results for an unshielded example display a concentration
of windings within the portion of the coil volume nearest the imaging region and looped
return path windings taken away from this region. However, for a shielded example the coil windings
are found to lie almost exclusively on biplanar surfaces, suggesting that this is the optimum geometry
for a shielded minimum power open coil.
Item Details
Item Type: | Refereed Article |
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Keywords: | Target-field method; Resonance SHIM coils; Lenght; optimization; geometry |
Research Division: | Mathematical Sciences |
Research Group: | Applied mathematics |
Research Field: | Applied mathematics not elsewhere classified |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the mathematical sciences |
UTAS Author: | While, PT (Dr Peter While) |
UTAS Author: | Forbes, LK (Professor Larry Forbes) |
ID Code: | 65949 |
Year Published: | 2010 |
Web of Science® Times Cited: | 10 |
Deposited By: | Mathematics |
Deposited On: | 2010-12-13 |
Last Modified: | 2011-03-23 |
Downloads: | 3 View Download Statistics |
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