An analytical approach to the design of quiet cylindrical asymmetric gradient coils in MRI

Forbes, Lawrence K, Brideson, Michael A, Crozier, Stuart and While, Peter T (2007) An analytical approach to the design of quiet cylindrical asymmetric gradient coils in MRI. Concepts In Magnetic Resonance Part B-magnetic Resonance Engineering, 31B 4: 218-236.


Author Forbes, Lawrence K
Brideson, Michael A
Crozier, Stuart
While, Peter T
Title An analytical approach to the design of quiet cylindrical asymmetric gradient coils in MRI
Journal name Concepts In Magnetic Resonance Part B-magnetic Resonance Engineering   Check publisher's open access policy
ISSN 1552-5031
Publication date 2007-10
Sub-type Article (original research)
DOI 10.1002/cmr.b.20095
Volume 31B
Issue 4
Start page 218
End page 236
Total pages 19
Editor Traficante, Daniel D
Place of publication Hoboken
Publisher John Wiley & Sons Inc
Collection year 2008
Language eng
Subject C1
0903 Biomedical Engineering
Abstract We consider the design of asymmetric gradient coils in a conventional cylindrical bore magnetic resonance imaging system. The gradient coils are switched on and off during the scan, and are therefore subject to Lorentz forces that cause them to buckle during the switching process. This in turn creates a pressure wave within the coil, and that gives rise to acoustic noise. We present a simplified linearized model for the deflection of the coil due to electromagnetic forces, which is amenable to solution using analytical methods. Closed-form solutions for the coil deflection and the pressure pulse and noise level within the coil are obtained. These are used to design new coil winding patterns so as to reduce the acoustic noise. Sample results are shown both for unshielded and shielded gradient coils. Extensions of this model are indicated, although it is suggested that the advantages of the present closed-form solutions might then not be available, and fully numerical solutions may be needed instead. (C) 2007 Wiley Periodicals, Inc.
Keyword Chemistry, Physical
Instruments & Instrumentation
Physics, Atomic, Molecular & Chemical
Spectroscopy
gradient coils
switching functions
Lorentz forces
elastic deformation
acoustic noise reduction
Target-field Method
Resonance Shim Coils
Bessel-functions
Zeros
Insert
Ducts
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Mon, 18 Feb 2008, 15:31:23 EST