Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-06-05
1989-04-11
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, 333221, G01R 3320
Patent
active
048209872
ABSTRACT:
A so-called birdcage coil must be quickly deactivated after having generated an RF magnetic field, so as not to disturb the detection of the generated spin resonance signals by the surface coil (or another coil). To this end, semiconductor switches are included in some of the rod conductors of the birdcage coil. The switches are arranged substantially halfway along the rod conductors, because the RF voltage exhibits a zero crossing at that area. As a result, the semiconductor switches can operate with a low voltage. It has been found that the interruption of the rod conductors which are situated in one symmetry half of the birdcage coil and which carry most current in that half suffices for substantial deactivation.
REFERENCES:
patent: 4564843 (1986-01-01), Cooper
patent: 4694255 (1987-09-01), Hayes
patent: 4717881 (1988-01-01), Flugan
Levy Stewart J.
O'Shea Kevin D.
U.S. Philips Corporation
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