Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1997-08-20
1999-05-11
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V3/00
Patent
active
059031506
ABSTRACT:
An antenna system, for use in an NMR or MRI apparatus which includes a radio frequency (RF) signal transmitter and a radio frequency (RF) signal receiver, includes at least first and second electromagnetically coupled circuits, the first circuit comprising a first inductance producing a first electromagnetic field flux vector, and the second circuit comprising a second inductance producing a second electromagnetic field flux vector having a component which interacts with a component of the first electromagnetic field flux vector. A switch system has a first switching position for coupling the first circuit to an output of the RF signal transmitter and preventing a damaging level of signal from the second circuit from being fed to an input of said RF signal receiver, and a second switching position for permitting an RF signal from the second circuit to be fed to an input of the RF signal receiver and decoupling the first circuit from the output of the RF signal transmitter. The antenna produces an electromagnetic field flux enclosing an examination object therewithin, to irradiate the examination object, when the switch system is in the first switching position. An electromagnetic field flux produced by a signal emitted by the examination object's relaxing nuclei is picked up by the antenna system and is fed to the RF signal receiver via the second circuit, when the switch system is in the second switching position. An array antenna system capable of producing a useful variety of electromagnetic field shapes and coverages may be made up of a combination of antenna elements.
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