Magnetic resonance imaging scanner with molded fixed shims

Magnetic resonance imaging scanner with molded fixed shims

A magnetic resonance imaging scanner includes a generally cylindrical main magnet assembly ( 10 ) that defines a cylinder axis ( 16 ). A first set of shims ( 60 ) are rigidly positioned inside the magnet assembly ( 10 ) at about a first distance (d 1 ) relative to the cylinder axis ( 16 ). A second...

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Bibliographische Detailangaben
Hauptverfasser: ALDEN JEROME S, MULDER GERARDUS B, EVERETT DENNIS K, SHARPLESS RONALD B, DOYLE TERRENCE M, HENDERSON ROBERT G, PEEREN GERARDUS N, AMOR WILLIAM H
Format: Patent
Sprache:eng
Schlagworte:
DETECTING MASSES OR OBJECTS
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:A magnetic resonance imaging scanner includes a generally cylindrical main magnet assembly ( 10 ) that defines a cylinder axis ( 16 ). A first set of shims ( 60 ) are rigidly positioned inside the magnet assembly ( 10 ) at about a first distance (d 1 ) relative to the cylinder axis ( 16 ). A second set of shims ( 62 ) are rigidly positioned inside the main magnet assembly ( 10 ) at about a second distance (d 2 ) relative to the cylinder axis ( 16 ). The second distance (d 2 ) is different from the first distance (d 1 ). A generally cylindrical radio frequency coil ( 26 ) is arranged inside the main magnet assembly ( 10 ) at about a third distance (d 3 ) relative to the cylinder axis ( 16 ). A plurality of gradient coils ( 20 ) are arranged inside the main magnet assembly ( 10 ) at about a fourth distance (d 4 ) relative to the cylinder axis ( 16 ).