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

1994-08-05

1997-10-21

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, 1286535, G01Y 300

Patent

active

056800460

ABSTRACT:
A magnetic resonance system includes a cylindrical shield disposed between a quadrature RF coil and surrounding gradient coils. The shield includes a pair of copper sheets separated by an insulating dielectric sheet. A pattern formed by cuts in one copper sheet aligns with the currents induced in the shield by one of the RF quadrature fields, and a pattern formed by cuts in the other copper shield aligns with the other RF quadrature field. The copper sheets are shorted together to prevent voltage breakdowns and short cuts are made in each to prevent gradient induced eddy currents.

REFERENCES:
patent: 4506224 (1985-03-01), Krause
patent: 4642569 (1987-02-01), Hayes et al.
patent: 4879515 (1989-11-01), Roemer et al.
patent: 5243286 (1993-09-01), Rzedzian et al.
patent: 5367261 (1994-11-01), Frederick

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