Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1987-06-05
1989-03-07
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3322
Patent
active
048109681
ABSTRACT:
In a magnetic resonance imaging apparatus comprising a surface coil, the circuit in which the surface coil is included is interrupted by means of a PIN diode in the non-active state of the coil. In addition to the PIN diode in the resonant circuit of the surface coil, PIN diodes are included in all supply leads of the resonant circuit. An advantage thereof consists in that no RF currents will flow in the supply leads and that the induction voltages generated in the surface coil in the active state of the transmitter coil of the device are actually rectified by the diodes and themselves form a blocking voltage for the PIN diodes included in the circuit. As a result, the biasing of the PIN diodes is increased, so that they remain blocked.
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Engle, J. L., "Broadband Transmit/Receive Circuit for NMR", Rev. Sci. Instrum., 49(g) (Sep. 1978) pp. 1356-1357.
Moores, M. B. et al., "VHF Pulsed Magnetic Resonance Duplexers", Rev. Sci. Instrum, 42(g) (Sep. 1971) pp. 1329-1333.
Kan, S., et al., "A Versatile and Inexpensive Electronic System for a High Resolution NMR Spectrometer", Rev. Sci. Instrum, 44(12) (Dec. 1973) pp. 1725-1733.
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Fess Lawrence G.
Franzblau Bernard
Levy Stewart J.
U.S. Philips Corp.
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