Magnetic resonance imaging scanner with molded fixed shims

Details Magnetic resonance imaging scanner with molded fixed shims Magnetic resonance imaging scanner with molded fixed shims

2004-04-19

2009-02-24

Shrivastav, Brij B. (Department: 2831)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

Reexamination Certificate

active

07495441

ABSTRACT:
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 (d1) 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 (d2) relative to the cylinder axis (16). The second distance (d2) is different from the first distance (d1). A generally cylindrical radio frequency coil (26) is arranged inside the main magnet assembly (10) at about a third distance (d3) 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 (d4) relative to the cylinder axis (16).

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