Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1997-03-21
1998-07-28
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324319, G01V 300
Patent
active
057866953
ABSTRACT:
The magnetic field assembly of a magnetic resonance imaging device includes an annular superconducting magnet (10) which is mounted within a toroidal vacuum vessel (24). Two cylindrical members (26, 46) define an annular gap (58). A shim set (60) for shimming the uniformity of the magnetic field is mounted in the gap (58). The shim set includes a plurality of shim trays (62), each of which defines a plurality of shim receiving pockets (64). A bottom wall (81) of each pocket is spaced from the cylindrical member (26) by side walls (76) and feet (78) to minimized heat flow. Shim tray covers (68) have flanges (90) and narrow contact surfaces (94) which are cammed against surfaces (61) of spacers (56) to press the cover on the tray and the tray feet against the cylinder (26) while minimizing heat flow through the spacers to the shims.
REFERENCES:
patent: 4771244 (1988-09-01), Vermilyea
patent: 5323136 (1994-06-01), Oue et al.
patent: 5349297 (1994-09-01), DeMeester et al.
patent: 5389909 (1995-02-01), Havens
patent: 5532597 (1996-07-01), McGinley et al.
patent: 5550472 (1996-08-01), Richard et al.
patent: 5623430 (1997-04-01), Dorri
Alden Jerome S.
Amor William H.
DeMeester Gordon D.
Gruden James L.
Ling Junxiao
Arana Louis M.
Picker International Inc.
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