A time-harmonic target-field method for designing unshielded RF coils in MRI

While, P. T., Forbes, L. K. and Crozier, S. (2005) A time-harmonic target-field method for designing unshielded RF coils in MRI. Measurement Science and Technology, 16 4: 997-1006. doi:10.1088/0957-0233/16/4/012


Author While, P. T.
Forbes, L. K.
Crozier, S.
Title A time-harmonic target-field method for designing unshielded RF coils in MRI
Journal name Measurement Science and Technology   Check publisher's open access policy
ISSN 0957-0233
1361-6501
Publication date 2005
Sub-type Article (original research)
DOI 10.1088/0957-0233/16/4/012
Volume 16
Issue 4
Start page 997
End page 1006
Total pages 10
Editor P. Hauptmann
Place of publication Bristol, U.K.
Publisher Institute of Physics Publishing
Collection year 2005
Language eng
Subject C1
291500 Biomedical Engineering
729901 Technological and organisational innovation
Abstract Time-harmonic methods are required in the accurate design of RF coils as operating frequency increases. This paper presents such a method to find a current density solution on the coil that will induce some desired magnetic field upon an asymmetrically located target region within. This inverse method appropriately considers the geometry of the coil via a Fourier series expansion, and incorporates some new regularization penalty functions in the solution process. A new technique is introduced by which the complex, time-dependent current density solution is approximated by a static coil winding pattern. Several winding pattern solutions are given, with more complex winding patterns corresponding to more desirable induced magnetic fields.
Keyword Electromagnetic
Magnetic resonance imaging (MRI)
Radio frequency (RF) coils
Time-harmonic
Target-field method
Inverse technique
Regularization
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 07:22:42 EST