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Mutual-inductance-NMR-RF-coil-matching-device

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Mutual inductance NMR RF coil matching device

Details

Inventors: Jaskolski, Patrick L.; Eash, Matthew G.;
Assignee: General Electric Company (Milwaukee, WI)
Primary Examiner: Levy; Stewart J.
Assistant Examiner: O'Shea; Kevin D.
Attorney, Agent or Firm: Gerasimow; Alexander M., Stoner; Douglas E.

A matching device uses mutual inductance to couple an NMR radio frequency (RF) coil to an RF power amplifier and RF receiver preamplifier. The device includes a matching coil connected to the RF power amplifier and preamplifier and which is positioned between the NMR RF coil and a decoupling shield in a region where RF flux density, produced by the NMR RF coil, is maximum. This ensures effective coupling to the NMR RF coil and provides a way for adjusting the degree of coupling (hence, input impedance) by varying the area of the matching coil available for intercepting the RF flux.

DETAILED DESCRIPTION An NMR scanner apparatus includes an RF coil for transmitting and receiving radio frequency signals.
When the coil is operated in the transmitting mode, it is coupled to a source of RF energy.
In the receiving mode, the RF coil is coupled to a radio frequency receiver.
A matching coil is provided for coupling the NMR RF coil to the source of RF energy and to the receiver using mutual inductance.
To this end, in operation, the matching coil is disposed in the magnetic flux field of the RF coil.

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