Integral passive shim system for a magnetic resonance apparatus
First Claim
1. A device for adjusting a spatial dependence of a magnetic field in a working volume of a main field magnet using ferromagnetic field shaping elements, the device comprising:
- at least one ferromagnetic toil or sheet metal having openings, said openings having shapes, positions and sizes selected such that a shape and amount of ferromagnetic material remaining in said foil or sheet metal shims the magnetic field in the working volume of the main field magnet, wherein said foil or sheet metal Is self-supporting and surrounds the working volume of the main field magnet.
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Accused Products
Abstract
In an arrangement for adjusting the spatial dependence of a magnetic field in a working volume of a main field magnet (19) by means of ferromagnetic field shaping elements (16), the field shaping elements (16) are formed from foils (1, 5, 7, 8) and/or sheet metals (10) having openings (2, 3) whose shape, position and size are selected such that the shape and the amount of the remaining ferromagnetic material produces a desired spatial dependence of the magnetic field in the working volume of the main field magnet for appropriate positioning of the foils (1, 5, 7, 8) and/or sheet metals (10) relative to the working volume of the main field magnet.
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Citations
16 Claims
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1. A device for adjusting a spatial dependence of a magnetic field in a working volume of a main field magnet using ferromagnetic field shaping elements, the device comprising:
at least one ferromagnetic toil or sheet metal having openings, said openings having shapes, positions and sizes selected such that a shape and amount of ferromagnetic material remaining in said foil or sheet metal shims the magnetic field in the working volume of the main field magnet, wherein said foil or sheet metal Is self-supporting and surrounds the working volume of the main field magnet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
Specification