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An inverse method for designing RF phased array coils in MRI-theoretical considerations

Citation

While, PT and Forbes, LK and Crozier, S, An inverse method for designing RF phased array coils in MRI-theoretical considerations, Measurement Science & Technology, 18, (1) pp. 245-259. ISSN 0957-0233 (2007) [Refereed Article]

DOI: doi:10.1088/0957-0233/18/1/031

Abstract

Phased array coils afford a number of advantages over RF volume coils, including a high SNR over a large field of view. In this paper, a time-harmonic inverse method is presented for the theoretical design of RF phased arrays. The method allows any array size to be considered, for which a homogeneous magnetic field is desired within some spherical target region within the coils. An ill-conditioned integral equation is solved using regularization, whereby the error between induced and target magnetic fields is minimized along with an additional constraint related to the curvature of the coil windings. The ability to focus the RF field to arbitrary locations within the coil volume is incorporated into the model and a number of examples are displayed. Attention is also given to the polarization of the induced field, with the direction of linear polarization investigated along with circular polarization. Phased arrays comprising smooth windings that are able to induce highly homogeneous magnetic fields are displayed and discussed for a range of array sizes, and for several different field focusing and polarization considerations. © 2007 IOP Publishing Ltd.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Other Physical Sciences
Research Field:Medical Physics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:While, PT (Dr Peter While)
Author:Forbes, LK (Professor Larry Forbes)
ID Code:44423
Year Published:2007
Web of Science® Times Cited:6
Deposited By:Mathematics
Deposited On:2007-08-01
Last Modified:2008-04-04
Downloads:0

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