Surface coils with integrated shims

Details Surface coils with integrated shims Surface coils with integrated shims

1998-01-26

2000-02-08

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324320, 324309, G01V 300

Patent

active

06023167&

ABSTRACT:
A localized shim coil (34) for use in a magnetic resonance imaging system includes a plurality of conductive elements (22a-d). The plurality of conductive elements (62a-d) are connected to a current source (64). The plurality of conductive elements (62a-d) are arranged adjacent to a localized region of a subject being imaged such that current flowing through the conductive elements generates a localized magnetic field. A plurality of series connected choke and resister pairs (66a-d) and (68a-d), respectively, are connected to the plurality of conductive elements (62a-d). The chokes (66a-d) present high impedance to currents having frequencies substantially the same as a resonant frequency of the magnetic resonance imaging system. The resisters (68a-d) balance the current flowing through each conductive element (62a-d). The localized magnetic field is generated such that it is substantially equal and opposite to localized non-uniformities generated in the magnetic resonance system's main magnetic field by the subject's geometric shape and magnetic susceptibility in the localized region being imaged.

REFERENCES:
patent: 4680551 (1987-07-01), O'Donnell et al.
patent: 4740753 (1988-04-01), Glover et al.
patent: 5351006 (1994-09-01), Sumanaveera et al.
patent: 5391990 (1995-02-01), Schmitt et al.
patent: 5532597 (1996-07-01), McGinley et al.
patent: 5550472 (1996-08-01), Richard et al.
patent: 5635839 (1997-06-01), Srivastava et al.

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