Magnetic resonance imaging apparatus and method for correcting t

Details Magnetic resonance imaging apparatus and method for correcting t Magnetic resonance imaging apparatus and method for correcting t

1997-03-28

1999-03-02

Lateef, Marvin M.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

324318, 324320, 324307, 324309, A61B 5055

Patent

active

058763376

ABSTRACT:
An MRI apparatus has a plurality of shim coils 102 and gradient magnetic field coils 104, which are connected to power sources 103 and 105 respectively. These power sources are controlled by a computer 112 to correct intensity of a static magnetic field generated by a magnet. For this purpose, the power sources 103 and 105 supply composite current of DC and AC so that the shim coils and the gradient magnetic field coils generate a rotating magnetic field. As a result, the uniformity of the static magnetic field in a region of an object under examination is improved and image distortion is suppressed. The MRI apparatus can be effectively applied to a fast imaging technique, an imaging technique where NMR signals of adipose tissue are suppressed, and a high resolution spectrum.

REFERENCES:
patent: 4425547 (1984-01-01), Sugimoto
patent: 4761612 (1988-08-01), Holland et al.
patent: 5530352 (1996-06-01), Kolem
patent: 5661401 (1997-08-01), Ishikawa et al.

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