Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1999-04-23
2000-11-21
Oda, Christine
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
328319, 328309, G01V 300
Patent
active
061508179
ABSTRACT:
The invention concerns an improved magnetic resonance apparatus and method for substantially reducing the dead time of the apparatus, in order to recover as much of the submicrosecond FID signals as quickly as possible. A double-channel, out-of-phase signal combination is employed. Two RF receiving coils are arranged with identical ringing characteristics, preferably mutually perpendicular to one another. The RF signal received by one coil is phase shifted by 180.degree., amplified, and combined with the amplified RF signal received by the other coil. The ringing components cancel, while the FID components in phase quadrature do not. The transmitter/receiver apparatus may be of duplex or crossed coil configuration. In the latter case, one of the receiver coils may be orientated parallel to the main field so that it receives no FID signal and operates only to reduce the dead time. The invention is particularly well suited for imagers and spectrometers using pulsed electron paramagnetic resonance (EPR), for the detection of free radicals in biological systems, or for pulsed nuclear magnetic resonance (NMR), where relaxation times are of the order of 100 ns to 10 .mu.s.
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Alecci Marcello
Brivati John Anthony
Lurie David John
Placidi Guiseppe
Sotgiu Antonello
BTG International Limited
Oda Christine
Shrivastav Brij B.
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