Feed cable system for coils in high magnetic fields

Details Feed cable system for coils in high magnetic fields Feed cable system for coils in high magnetic fields

1993-08-09

1995-02-28

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

053940865

ABSTRACT:
A toroidal vacuum dewer (22) holds a superconducting magnet assembly (10) which generates a substantially temporally constant magnetic field through a central bore (12). A whole body gradient coil (30) and a whole body RF coil assembly (32) are mounted to a cylindrical member (24) of the dewar. An insertable gradient coil assembly (40) is selectively insertable into and removable from the bore. The insertable gradient coil assembly includes gradient coils for selectively generating magnetic field gradients along three mutually orthogonal axes, e.g. x, y, and z-axes. A flexible cable (42) connects the insertable gradient coil with a series of current amplifiers (44). The current amplifiers selectively generate current pulses which are fed along feed conductors (84) of the coil assembly and which return along return conductors (86) of the cable. The feed and return conductors are configured such that the net feed and the net return current traverse the same effective path in opposite directions. Stated more mathematically,

REFERENCES:
patent: 4587493 (1986-05-01), Sepponen
patent: 5036282 (1991-07-01), Morich et al.
patent: 5185576 (1993-02-01), Vavrek et al.
patent: 5235279 (1993-08-01), Kaufman et al.
patent: 5311134 (1994-05-01), Yamagata et al.
"Highly Linear Asymmetric Transverse Gradient Coil Design for Head Imaging", Myers, et al. SMRM Abstracts Aug. 1991, p. 711.

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