Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1994-02-14
1994-11-22
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01R 3328
Patent
active
053672615
ABSTRACT:
An NMR imaging apparatus includes an excitation coil with a plurality of conductive elements extending between two spaced-apart end loops to form conventional "birdcage" coil. A shield is provided to reduce interference between the excitation coil and gradient field coils. The shield comprises a first electrically conductive section having an open ring with a gap therein and a plurality of first members extending from the ring with each member terminating at a remote end. A capacitor is connected across the gap in the ring. A second electrically conductive section has another ring from which a like plurality of second members extend with each one terminating at a remote end. The remote end of each second member is spaced from a remote end of a corresponding one of the first members and a capacitor is connected across those remote ends.
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Arana Louis
General Electric Company
Mah Raymond Y.
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