Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1988-11-22
1990-02-06
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
048991104
ABSTRACT:
In a magnetic resonance imaging apparatus having a superconducting magnet to form a static magnetic field and capable of producing a magnetic resonance image of a test piece placed in the static magnetic field, a static magnetic field correcting coil corrects the intensity of the static magnetic field, and a power source supplies to the coil a current to form a magnetic field having inverse characteristics with respect to the attenuation pattern of the static magnetic field intensity in the superconducting magnet. Since the static magnetic field correcting coil is supplied with such a current, enhances the stability of the static magnetic field at the time of raising such a magnetic field or immediately after changing the intensity thereof.
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patent: 4683434 (1987-07-01), Tschopp
patent: 4724412 (1988-02-01), Kalafala
patent: 4761614 (1988-08-01), Prammer et al.
patent: 4812797 (1989-03-01), Jayakumar
Nuclear Magnetic Resonance NMR Imaging, C. Leon Partain et al, 1983, pp. 115-121.
Kabushiki Kaisha Toshiba
O'Shea Kevin D.
Tokar Michael J.
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