Shield for decoupling RF and gradient coils in an NMR apparatus

Details Shield for decoupling RF and gradient coils in an NMR apparatus Shield for decoupling RF and gradient coils in an NMR apparatus

1983-12-16

1987-02-10

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324300, G01R 3320

Patent

active

046425691

ABSTRACT:
A shield for decoupling radio frequency (RF) and magnetic field gradient coils in an NMR apparatus is made up of first and second arrays of electrically conductive regions separated from one another by relatively narrow non-conductive regions. The arrays are disposed on opposite surfaces of a member formed of a high dielectric material. The conductive regions of one array are offset relative to the conductive regions of the other array such that the conductive regions of the one array bridge the non-conductive regions of the other array to form a plurality of capacitive elements. In operation, the capacitive elements act essentially as electrical short-circuits at radio frequencies, but transmit substantially unaffected the homogeneous magnetic field and audio frequencies associated with pulsed magnetic field gradients.

REFERENCES:
patent: 3409805 (1968-11-01), Whipple
patent: 3569823 (1971-03-01), Golay
patent: 4310799 (1982-01-01), Hutchison
patent: 4490675 (1984-12-01), Knuettel
patent: 4506224 (1985-03-01), Krause

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