Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-05-19
1989-11-07
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324314, G01R 3320
Patent
active
048795143
ABSTRACT:
The invention relates to a magnetic resonance imaging device comprising a transmitter/receiver which, with the exception of a few components is all digital. The transmitter comprises a digital frequency synthesizer, a single sideband modulator and a selective power amplifier, the single sideband modulator being controlled by a phase locked loop oscillator. The receiver comprises a selective pre-amplifier, a frequency mixing stage which is connected either to an output of the phase locked loop oscillator or to an output of the single sideband modulator, and an analog-to-digital converter which samples the output signal of the frequency mixing stage. The demodulation frequency for the receiver is chosen so that, after demodulation, a frequency band is obtained which is situated to one side of 0 Hz.
REFERENCES:
patent: 4110681 (1978-08-01), Hofer
patent: 4599565 (1986-07-01), Hoenninger
patent: 4604580 (1986-08-01), Sugiura
patent: 4654597 (1987-03-01), Hino
patent: 4673880 (1987-06-01), Compton
patent: 4677382 (1987-06-01), Vatis
Den Boef Johannes H.
Mehlkopf Antoon F.
Briody Thomas A.
Haken Jack E.
Slobod Jack D.
Tokar Michael J.
U.S. Philips Corporation
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