A hybrid, inverse approach to the design of magnetic resonance imaging magnets

Zhao, Huawei, Crozier, Stuart and Doddrell, David M. (2000) A hybrid, inverse approach to the design of magnetic resonance imaging magnets. Medical Physics, 27 3: 599-607.


Author Zhao, Huawei
Crozier, Stuart
Doddrell, David M.
Title A hybrid, inverse approach to the design of magnetic resonance imaging magnets
Journal name Medical Physics   Check publisher's open access policy
Publication date 2000-03
Sub-type Article
DOI 10.1118/1.598899
Volume number 27
Issue number 3
ISSN 0094-2405
Start page 599
End page 607
Total pages 9
Place of publication New York
Publisher American Institute of Physics
Collection year 2000
Language eng
Subject C1
090399 Biomedical Engineering not elsewhere classified
Abstract This paper describes a hybrid numerical method of an inverse approach to the design of compact magnetic resonance imaging magnets. The problem is formulated as a field synthesis and the desired current density on the surface of a cylinder is first calculated by solving a Fredholm equation of the first, kind. Nonlinear optimization methods are then invoked to fit practical magnet coils to the desired current density. The field calculations are performed using a semi-analytical method. The emphasis of this work is on the optimal design of short MRI magnets. Details of the hybrid numerical model are presented, and the model is used to investigate compact, symmetric MRI magnets as well as asymmetric magnets. The results highlight that the method can be used to obtain a compact MRI magnet structure and a very homogeneous magnetic field over the central imaging volume in clinical systems of approximately 1 m in length, significantly shorter than current designs. Viable asymmetric magnet designs, in which the edge of the homogeneous region is very close to one end of the magnet system are also presented. Unshielded designs are the focus of this work. This method is flexible and may be applied to magnets of other geometries. (C) 2000 American Association of Physicists in Medicine. [S0094-2405(00)00303-5].
Keyword Radiology, Nuclear Medicine & Medical Imaging
Mri Magnet
Symmetric Design
Asymmetric Design
Hybrid Numerical Method
Mri Magnet
Coils
Optimization
Gradient
Main
Q-Index Code C1

Document type: Journal Article
Sub-type: Article
Collection: School of Information Technology and Electrical Engineering Publications
 
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Created: Mon, 13 Aug 2007, 11:39:57 EST