Apparatus for dynamically disabling an NMR field coil

Details Apparatus for dynamically disabling an NMR field coil Apparatus for dynamically disabling an NMR field coil

1987-12-21

1989-05-23

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

048334090

ABSTRACT:
A detunable coil assembly for an NMR imaging system has a cylindrical cage coil comprising two spaced-apart conductive end loops with a plurality of conductive segments extending between the loops. A grounded shield is disposed around the cage coil. Each of the end loops is coupled to the shield by four switchable impedance circuits that are equidistantly spaced around the loop. Each impedance means includes a coaxial cable having a length equal to one-quarter the wavelength of the resonant frequency of the cage coil with the central conductor coupled at one end to the cage coil and the other conductor connected to the shield. A PIN diode terminates the other end of the coaxial cable. A voltage supply provides potentials for alternately forward and reverse biasing the PIN diode.

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