Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1986-08-14
1988-03-15
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01R 3320
Patent
active
047315849
ABSTRACT:
A magnetic field control (A) causes a magnetic field through an imaging region of a magnetic resonance spectrometer. A radio frequency generator (20) generates radio frequency signals which are transmitted on a transmission line (22) to a probe coil (C). Magnetic resonance signals received by the probe coil (C) are conveyed over the transmission line to a radio frequency receiver (24) for reconstruction into a magnetic resonance image. An inductive matching network (D) is connected between the probe coil and the transmission line for matching the resistive impedance of the coil with the resistive impedance of the transmission line and for resonating the coil at a frequency other than its self resonance frequency. When the probe coil is operated above the self resonance frequency, it is capacitively reactive. An inductor (40) is connected across coil feed points (30, 32) of the probe coil. The inductive reactance of the matching inductor is selected such that the capacitive reactance of the probe coil at a selected frequency above the self resonance frequency is cancelled.
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"Quadrature Detection Coils-A Further .sqroot.2 Improvement in Sensitivity" by Chen, et al., J. of Mag. Res. 54, pp. 324-327, (1983).
"The NMR Receiver: A Description and Analysis of Design" by D. I. Hoult; Pro. in NMR Spectroscopy, vol. 12, pp. 41, 64-65 (1968).
Misic George J.
Patrick John L.
Levy Stewart J.
O'Shea Kevin D.
Picker International Inc.
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