Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1982-07-01
1984-04-17
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324313, 324314, G01R 3308
Patent
active
044437609
ABSTRACT:
The effects of a spurious free induction decay (FID) NMR signal due to imperfect 180.degree. RF pulses are eliminated by phase alternating the selective 90.degree. RF pulses and subtracting alternate ones of the NMR signals. The desired signals due to the 90.degree. RF pulses reinforce, while the signals produced by the imperfect 180.degree. pulses cancel. This method also has the beneficial effect of eliminating DC offset in the desired signal which, when present, causes artifacts in NMR images. Another method to eliminate the effects of spurious FID signals due to imperfect 180.degree. pulses is to phase alternate these 180.degree. pulses on successive NMR imaging pulse sequences and add successive NMR signals. In this case, the phase shifted spurious FID signals cancel, while the desired NMR signals reinforce. The latter method does not eliminate the effects of DC offset, however.
REFERENCES:
patent: 4290019 (1981-09-01), Hutchison
patent: 4339716 (1982-07-01), Young
patent: 4384255 (1983-05-01), Young
"Phase and Intensity Anomalies in Fourier Transform NMR", Ray Freeman and H. D. W. Hill, Jr., Journal of Mag. Res., vol. 4, pp. 366-383.
Bottomley Paul A.
Edelstein William A.
Cutter Lawrence D.
Davis Jr. James C.
General Electric Company
Snyder Marvin
Tokar Michael J.
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