Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1982-07-01
1984-11-20
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01R 3308
Patent
active
044841388
ABSTRACT:
A method for eliminating the effects of a spurious free induction decay (FID) NMR signal due to imperfect 180.degree. RF pulses comprises applying a large magnitude, short duration magnetic field gradient pulse, termed the "crusher" pulse immediately following the 180.degree. pulse. When the method is employed with NMR pulse sequences in which the 180.degree. pulse is part of a spin echo type refocusing RF pulse sequence, the 180.degree. pulse is preceded by a magnetic field gradient pulse termed the "primer", having an equal integral with respect to time as the crusher pulse. The method is effective in removing NMR image artifacts produced by spurious FID in both planar and three-dimensional NMR imaging methods.
REFERENCES:
patent: 4045723 (1977-08-01), Ernst
patent: 4318043 (1982-03-01), Crooks
patent: 4431968 (1984-02-01), Edelstein et al.
Application S.N. (General Electric Co. Docket RD-13,822) filed concurrently herewith.
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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