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US 4,651,099 AGranted
Scan room for magnetic resonance imager
AssigneeNMR Associates, Ltd. 1983-I
InventorsHarold J. Vinegar, Jefferson H. Taylor
Life of this patent
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AssigneeNMR Associates, Ltd. 1983-I
InventorsHarold J. Vinegar, Jefferson H. Taylor
Estimating the term…
A scan room is disclosed in which a magnetic resonance (MR) imager can be located that will reduce to an acceptable level outside the room the strength of the fringe magnetic fields produced by the imager and that will shield the imager from magnetic, radio frequency electromagnetic, and electric fields outside the room, while allowing the magnet of the imager to be shimmed to produce a sufficient homogeneous field to obtain the desired images. The scan room is rectangular although it could be cylindrical or spherical. Its walls, floor, and ceiling are made of a plurality of steel plate welded together. The thickness of the walls can vary as the distance from the magnet and the permeability of the steel plates varies. A steel door allows patients and medical personnel to enter and leave the room.
A scan room in which a magnetic resonance (MR) imager can be located that will reduce to an acceptable level outside the room the strength of the fringe magnetic fields produced by the imager and that will shield the imager from magnetic, radio frequency, and electric fields external to the room while allowing the magnet of the imager to be shimmed to produce a sufficiently homogeneous field to obtain the desired images;
A scan room that is large enough to completely enclose a full body magnetic resonance (MR) imager and that will reduce to an acceptable level outside the room the strength of the fringe magnetic fields produced by the imager and shield the imager from magnetic and radio frequency field produced outside the room while allowing the magnet of the imager to be shimmed to produce a field sufficiently homogeneous to obtain the desired images, said scan room comprising side walls of welded steel plates of a steel symmetrically encircling the MR device and spaced therefrom, a floor of welded steel plates extending between the side walls below the imager, and a ceiling of welded steel plates extending between the side walls above the imager, said plates being made of a steel having sufficient thickness to reduce the fringe magnetic field outside the housing to below five gauss, means for electrically insulating the plates from earth ground except at one point, an opening in the side walls providing ingress and egress to the room and the imager, and door means for closing the opening to maintain the magnetic and radio fields outside the housing below five gauss.
Dependencies are inferred from the claim text.