Gradient power source apparatus for magnetic resonance imaging s

Details Gradient power source apparatus for magnetic resonance imaging s Gradient power source apparatus for magnetic resonance imaging s

1992-11-25

1994-05-10

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

053111362

ABSTRACT:
A capacitor is connected in parallel with a gradient coil to form a parallel resonance circuit with the gradient coil. A gradient coil current is reversed utilizing parallel resonance of the gradient coil and the capacitor. The gradient coil current is detected by a shunt resistor connected in series to a power source. A voltage across the shunt resistor is compared with a reference voltage to control a power-source voltage, thereby controlling a gradient-coil current waveform. This arrangement allows imaging sequences to be performed in a short time without involving gradient field waveform distortion and increasing power consumption. A gradient power source apparatus suited for ultra high-speed MRI apparatus is provided.

REFERENCES:
patent: 4437053 (1984-03-01), Bax
patent: 4628264 (1986-12-01), Rzedzian
patent: 4703275 (1987-10-01), Holland
patent: 4820986 (1989-04-01), Mansfield et al.
patent: 4961054 (1990-10-01), Park et al.
patent: 5063349 (1991-11-01), Roemer et al.

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