Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

1993-02-10

1994-11-15

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

053651740

ABSTRACT:
In a magnetic resonance imaging apparatus, picture quality of a tomographic image is prevented from deteriorating by reducing the influence due to a change in environmental magnetic field around magnetic field generating means. A phase correcting circuit for correcting the phase of a correcting current supplied to correcting magnetic field coils is provided in a correction control circuit which amplifies a detection signal representative of the change in the environmental magnetic field from a magnetic field sensor. This enables to correct the phase of a correcting magnetic field generated from the correcting magnetic field coils. The difference between the phase of the change in the environmental magnetic field and the correcting magnetic field generated by the correcting magnetic field coils can be reduced.

REFERENCES:
patent: 4788502 (1988-11-01), Keller et al.
patent: 5029287 (1991-07-01), Dessalles-Martin et al.

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