An inverse method for designing loaded RF coils in MRI

While, P. T., Forbes, L. K. and Crozier, S. (2006) An inverse method for designing loaded RF coils in MRI. Measurement Science & Technology, 17 9: 2506-2518. doi:10.1088/0957-0233/17/9/019

Author While, P. T.
Forbes, L. K.
Crozier, S.
Title An inverse method for designing loaded RF coils in MRI
Journal name Measurement Science & Technology   Check publisher's open access policy
ISSN 0957-0233
Publication date 2006
Sub-type Article (original research)
DOI 10.1088/0957-0233/17/9/019
Volume 17
Issue 9
Start page 2506
End page 2518
Total pages 13
Editor P. Hauptmann
Place of publication Bristol, UK
Publisher Institute of Physics Publishing Ltd
Collection year 2006
Language eng
Subject C1
291500 Biomedical Engineering
671402 Medical instrumentation
Abstract Radio-frequency ( RF) coils are designed such that they induce homogeneous magnetic fields within some region of interest within a magnetic resonance imaging ( MRI) scanner. Loading the scanner with a patient disrupts the homogeneity of these fields and can lead to a considerable degradation of the quality of the acquired image. In this paper, an inverse method is presented for designing RF coils, in which the presence of a load ( patient) within the MRI scanner is accounted for in the model. To approximate the finite length of the coil, a Fourier series expansion is considered for the coil current density and for the induced fields. Regularization is used to solve this ill-conditioned inverse problem for the unknown Fourier coefficients. That is, the error between the induced and homogeneous target fields is minimized along with an additional constraint, chosen in this paper to represent the curvature of the coil windings. Smooth winding patterns are obtained for both unloaded and loaded coils. RF fields with a high level of homogeneity are obtained in the unloaded case and a limit to the level of homogeneity attainable is observed in the loaded case.
Keyword Magnetic Resonance Imaging (mri)
Radio-frequency (rf) Coil
Coil Design
Inverse Method
Loaded Coil
Magnetic Field Homogeneity
Engineering, Multidisciplinary
Instruments & Instrumentation
Target-field Method
Shim Coils
Electromagnetic Scattering
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 08:25:05 EST