Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

1996-07-25

1999-02-02

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

058670270

ABSTRACT:
In a magnetic resonance imaging apparatus, gradient magnetic fields and a radiofrequency magnetic field are applied to a subject placed in a static magnetic field to excite nucleuses and generate magnetic resonance signals. A magnetic resonance image is reconstructed on the basis of the magnetic resonance signals. The gradient magnetic fields are produced by gradient coils. A very high-speed imaging method such as an echo planar method requires shield coils to magnetically shield, to the outside, the magnetic fields generated by the primary coils. It is very difficult to drive the primary coils and the shield coils by one amplifier to raise gradient magnetic fields having a relatively high strength within a short period of time. The primary coils and the shield coils are divided into a plurality of groups, and currents are individually supplied to the plurality of groups to allow to raise the gradient magnetic fields having a relatively high strength within the short period of time.

REFERENCES:
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patent: 4737716 (1988-04-01), Roemer et al.
patent: 4890082 (1989-12-01), Fujita
patent: 4924186 (1990-05-01), Kawamoto et al.
patent: 4978920 (1990-12-01), Mansfield et al.
patent: 5329266 (1994-07-01), Soeldner et al.
patent: 5488299 (1996-01-01), Kondo et al.

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