Gradient current speed-up circuit for high-speed NMR imaging sys

Details Gradient current speed-up circuit for high-speed NMR imaging sys Gradient current speed-up circuit for high-speed NMR imaging sys

1989-07-06

1990-10-02

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

363132, G01R 3320

Patent

active

049610546

ABSTRACT:
A gradient current speed-up circuit, for use in a higher-speed NMR imaging system with a gradient power amplifier and an associated gradient coil, has an energy-storage element, with an inductance typically between 5 and 20 times the inductance of the associated gradient coil. A plurality of semiconductor switching elements receive the current output of the energy-storage element; and the associated gradient coil is connected between selected ones of these semiconductors devices. The semiconductor devices are turned on and off in selected patterns, to cause the energy-storage element current to be suddenly applied to and removed from flow through the associated gradient coil.

REFERENCES:
patent: 4667159 (1987-05-01), Hodsoll et al.
patent: 4701711 (1987-10-01), Willard et al.
patent: 4733342 (1988-03-01), Mueller et al.
patent: 4820986 (1989-04-01), Mansfield et al.

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