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Proceedings Paper

Fabrication And Performance Of Cylindrical Iron Shields For MRI Systems
Author(s): M. J. Flynn; J. Ewing; J. Froelich; C. Issa; B. Vavrek
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Paper Abstract

Using analytic and experimental methods, we have investigated the design, fabrication, and performance of axially symmetric shields which minimize the field perturbation within the central bore of an MR magnet. Magnetic resonance shields have been built for 1.9 tesla/60 cm bore and 1.5 tesla/100 cm bore superconducting magnets. The 1.9 T system is enclosed by a simple cylindrical shield having a weight of 49,000 pounds. The 1.5 T system shield is a 100,000 pound tapered thickness cylinder with conic ends. The shields are constructed from cold rolled steel sections which are welded in place at the magnet site. A low carbon, specially annealed steel with particularly desireable properties of induced magnetism has been employed. The 5 gauss line is constrained to a point 4.0 meters to the side of the 1.9 T magnet, 3.0 meters to the side of the 1.5 T magnet and 7.0 meters off the end of both magnets.

Paper Details

Date Published: 19 September 1985
PDF: 7 pages
Proc. SPIE 0555, Medical Imaging and Instrumentation '85, (19 September 1985); doi: 10.1117/12.949475
Show Author Affiliations
M. J. Flynn, Henry Ford Hospital (United States)
J. Ewing, Henry Ford Hospital (United States)
J. Froelich, Henry Ford Hospital (United States)
C. Issa, Henry Ford Hospital (United States)
B. Vavrek, Henry Ford Hospital (United States)

Published in SPIE Proceedings Vol. 0555:
Medical Imaging and Instrumentation '85
James A. Mulvaney, Editor(s)

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