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

While, Peter T., Forbes, Larry K. and Crozier, Stuart (2007) An inverse method for designing RF phased array coils in MRI: theoretical considerations. Measurement Science & Technology, 18 1: 245-259. doi:10.1088/0957-0233/18/1/031


Author While, Peter T.
Forbes, Larry K.
Crozier, Stuart
Title An inverse method for designing RF phased array coils in MRI: theoretical considerations
Journal name Measurement Science & Technology   Check publisher's open access policy
ISSN 0957-0233
Publication date 2007-01
Sub-type Article (original research)
DOI 10.1088/0957-0233/18/1/031
Volume 18
Issue 1
Start page 245
End page 259
Total pages 15
Place of publication Bristol, U.K.
Publisher Iop Publishing Ltd
Language eng
Subject 1004 Medical Biotechnology
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.
Keyword Engineering, Multidisciplinary
Instruments & Instrumentation
magnetic resonance imaging (MRI)
radio
frequency (RF) coil
phased array
coil design
inverse method
Target-field Method
Parallel Mri
Shim Coils
Q-Index Code C1
Additional Notes Print publication: Issue 1 (January 2007) Received 17 October 2006, in final form 16 November 2006 Published 12 December 2006

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Information Technology and Electrical Engineering Publications
 
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Created: Mon, 18 Feb 2008, 15:57:44 EST