Nuclear magnetic resonance imaging apparatus using asymmetric to

Details Nuclear magnetic resonance imaging apparatus using asymmetric to Nuclear magnetic resonance imaging apparatus using asymmetric to

1996-03-15

1998-08-11

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

1286535, G01V 300

Patent

active

057932093

ABSTRACT:
A nuclear magnetic resonance imaging apparatus using asymmetric torque-free active shield gradient coils for realizing a sufficient imaging field of view, a sufficient eddy current magnetic field suppression effect, and a substantially complete torque cancellation. The gradient coil is formed by: a primary coil having an asymmetric current distribution in which all current returns are asymmetrically arranged toward one side of the primary coil, a shield coil having a current distribution for cancelling out a leakage magnetic field generated by the asymmetric current distribution of the primary coil, and a torque cancellation coil, provided adjacent to the primary coil and the shield coil, having a current distribution for cancelling out a torque acting on the primary coil and the shield coil in a static magnetic field. The primary coil generates the gradient magnetic field which cancels out a gradient field contribution from the torque cancellation coil to produce a desired gradient magnetic field.

REFERENCES:
patent: 5343148 (1994-08-01), Westphal et al.
patent: 5545996 (1996-08-01), Morich et al.
patent: 5561371 (1996-10-01), Schenck
patent: 5581185 (1996-12-01), Petropoulos et al.
Petropoulos et al., "Torque-Free Asymmetric Transverse Gradient Coil", 12th Annual Meetings of Society of Magnetic Resonance in Medicine, p. 1035 (1993).
Abduljalil et al., "Torque Compensated Asymmetric Gradient Coils for EPI", 12th Annual Meetings of Society of Magnetic Resonance in Medicine, p. 1036 (1993).

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