Magnetic gradient coil set for nuclear magnetic resonace system

Details Magnetic gradient coil set for nuclear magnetic resonace system Magnetic gradient coil set for nuclear magnetic resonace system

1987-10-07

1989-04-11

Levy, Steward J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

048209880

ABSTRACT:
In a gradient coil set for a magnetic resonance system, the y gradient coils are located substantially closer to the patient than are the x and z gradient coils. As a result, one may design the y gradient coils to produce a stronger y gradient, to have reduced inductance or otherwise better tailor the magnetic/electrical properties of the gradient coil set for MRI imaging sequences. In the exemplary embodiment, at least portions of the y gradient coils have a first spacing from the z-axis while the x and z gradient coils have a second substantially larger spacing from the z-axis. Furthermore, while the x and z gradient coils are centered about the z-axis in the patient access space, alternate sides of the y gradient coil set are centered about respectively off-set centers vertically displaced from the z-axis center of the patient access area. The result is a substantially rectangular or elliptical patient access opening with horizontal dimensions defined by the x, z coils sets and vertical dimensions defined by the y coil set.

REFERENCES:
patent: 3569823 (1971-03-01), Golay
patent: 3622869 (1971-11-01), Golay
patent: 4456881 (1984-06-01), Compton
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4712067 (1987-12-01), Roschmann et al.
patent: 4728895 (1988-03-01), Briguet et al.
Magnetic Resonance in Medicine, 1, 44-65, (1984), "Magnet Field Profiling: Analysis and Correcting Coil Design" by Romeo and Hoult.

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