Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1991-12-17
1994-01-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324311, 324313, 324314, G01R 3320
Patent
active
052785050
ABSTRACT:
In addition to the usual winding of an MRI RF receive coil, a second, opposite sense, winding is connected to the same pair of RF output terminals and linked to at least part of the same space as the first winding. One or more serially connected RF switches in the second winding selectively connect it in circuit only during transmission of NMR RF nutation pulses. Under these conditions, any transmitted RF fields linked to the first winding are also linked to the second winding. Accordingly, any induced RF currents flowing in the receive coil windings produce self-cancelling effects in the tissue being imaged (thereby reducing possible distortion of the desired transmit fields being used for NMR nutation purposes).
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Magnetic Resonance in Medicine 3.157-163 (1986)--"Elimination of Coupling between Cylindrical Transmit Coils and Surface-Receive Coils for in Vivo NMR" by Bendall et al.
Book of Abstracts, vol. 2, Society of Magnetic Resonance in Medicine Sixth Annual Meeting and Exhibition Aug. 17-21, 1987 New York City USA.
"Patient Safety in Surface Coil MRI" Boskamp et al p. 916. Intrinsic Safety of Electronically Tuned and Decoupled Surface Coils p. 838. by Krause et al.
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Book of Abstracts--vol. 2, Society of Magnetic Resonance in Medicine Eighth Annual Meeting and Exhibition Aug. 12-18, 1989 "Computer Modelling of Passive Decoupling Circuits" p. 958--by John van Heteren et al.
Mah Raymond Y.
The Regents of the University of California
Tokar Michael J.
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