Nuclear magnetic resonance apparatus with surface coil detection

Details Nuclear magnetic resonance apparatus with surface coil detection Nuclear magnetic resonance apparatus with surface coil detection

1987-03-26

1991-04-09

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324322, G01R 3336

Patent

active

050068032

ABSTRACT:
For measurements with increased accuracy in a nuclear magnetic resonance apparatus, the detection device is equipped with one or more surface coils which act as measuring coils. To avoid mutual interference between a radio-frequency transmitting coil and the measuring coil, the measuring coil is provided with a decoupling circuit. The surface coil and the decoupling circuit form a part of a tuned circuit which is tuned to a significantly higher natural frequency during activation of the transmitting coil. On the other hand, the transmitting coil is shorted during detection with the surface coil by a low resistance shorting circuit, thereby avoiding interference with the radio-frequency transmission signals.

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E. Boskamp, Application of Surface Coils in MR Imaging, Medicamundi, vol. 29, No. 2, 1984, p. 76.
K. Kisman et al., Coupling Scheme and Probe Damper for Pulsed Nuclear Magnetic Resonance Single Coil Probe, Sep. 1974, Rev. Sci. Instrum., vol. 45, No. 9.
G. Samuelson et al., Self-Switching Damping Circuit for Reducing Transmitter Ringdown Time in High Power Pulse NMR, Nov. 1970, Rev. Sci. Instrum., vol. 41, No. 11

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