Considerations in the design of MRI magnets with reduced stray fields

Author

Hawksworth, D.G. ; McDougall, I.L. ; Bird, J.M. ; Black, D.

Author_Institution

Oxford Magnet Technology Ltd., Oxon, England

Volume

23

Issue

2

fYear

1987

fDate

3/1/1987 12:00:00 AM

Firstpage

1309

Lastpage

1314

Abstract

One of the major considerations in siting choice for an MRI system within a hospital is its interactions with its environment. This interaction places restrictions on the proximity of equipment sensitive to magnetic field and limits areas of general public access. In addition special account must be taken of the possible impact of environmental iron on magnet homogeneity. To date, the approach adopted by the MRI system scanner manufacturers to these problems has been to employ either YOKE or MIRROR iron (PASSIVE) shielding frequently requiring significant structural modifications with associated costs. An alternative approach to the shielding problem has been investigated at OXFORD using a geometry utilising superconducting counter running coils alone and prototypes with Central fields of 0.5T, 1.0T and 1.5T have been tested.

Keywords

Biomedical imaging, MRI; Magnetic shielding; Superconducting magnets; Costs; Geometry; Hospitals; Iron; Magnetic resonance imaging; Magnetic shielding; Magnets; Manufacturing; Mirrors; Superconducting coils;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1987.1065051

Filename

1065051