Magnetic resonance imaging system

Details Magnetic resonance imaging system Magnetic resonance imaging system

1991-06-25

1993-08-10

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

052352811

ABSTRACT:
In an magnetic resonance imaging system of the echo planar imaging method, a gradient field Gx is generated by a linear type transconductance amplifier and gradient fields Gy and Gz are generated by an amplifier which is formed of a resonant type amplifier or a current type inverter for outputting a first current of a given waveform, a linear type transconductance amplifier for outputting a second current of an arbitrary waveform at a lower level than that of the first current, a gradient field coil having first and second windings for respectively running the first and second currents, the first and second windings being wound in a bifilar form, and a cancel coil for canceling a voltage induced by the gradient field coil, the cancel coil having third and fourth windings for respectively connected between the first winding and the resonant type amplifier or a current type inverter and between the second winding and the linear type transconductance amplifier, the third and fourth windings being wound in a bifilar form.

REFERENCES:
patent: 4794338 (1988-12-01), Roemer et al.
patent: 4878023 (1989-10-01), Overweg et al.
patent: 4916395 (1990-04-01), Usui

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