Double-sided RF shield for RF coil contained within gradient coi

Details Double-sided RF shield for RF coil contained within gradient coi Double-sided RF shield for RF coil contained within gradient coi

1988-12-22

1989-11-07

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

048795151

ABSTRACT:
A double-sided RF shield, for use between a set of gradient coils and an RF coil, is a hollow member formed of a conductor-dielectric-conductor laminate. Each conductor is a sheet divided into first and second opposed half-cylinders, each having a plurality of conductive streamline loop portions with a series of nonconductive cut lines formed therebetween, with each of the cut lines being parallel to the RF current. Each of the loops is separated into a "C"-shaped conductive portion along at least one "radial" line cut in each half-cylinder. The cut lines are substantially opposite to one another on opposite surfaces of the half-cylinders, to form a loop with a pair of series capacitances of maximized value, which shield the RF current, yet pass gradient magnetic fields in all three mutually orthogonal directions of a Cartesian coordinate system.

REFERENCES:
patent: 4621237 (1986-11-01), Timms
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4668915 (1987-05-01), Daubin
patent: 4771256 (1988-09-01), Laskaris
patent: 4791370 (1988-12-01), Mackinnon

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