Polarization transfer by selective homonuclear technique for sup

Details Polarization transfer by selective homonuclear technique for sup Polarization transfer by selective homonuclear technique for sup

1986-08-01

1987-10-20

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324308, 324312, G01R 3320

Patent

active

047017082

ABSTRACT:
A method of suppressing at least one undesired resonance response signal while facilitating reception of at least one other desired NMR response signal from a coupled spin resonance in NMR spectroscopy, utilizes a pair of alternating sequences of RF signal pulses, with each sequence having an initial .pi./2 RF pulse, followed by a .pi. RF signal pulse having a temporal midpoint at a time interval T after the temporal midpoint of the initial pulse (where T=n/4J, with n being an odd integer and J being the spin coupling constant of the hydrogen nuclei) and a final .pi. RF signal pulse with a temporal midpoint at twice the time interval T after the temporal midpoint of the first .pi. RF signal pulse in that sequence. Only one of the pair of sequences is provided with a polarization transfer narrowband .pi. RF signal pulse symmetrically disposed about a temporal midpoint located at substantially a time interval T after the first .pi. RF signal pulse of that sequence and substantially at a frequency removed from the resonance frequency of at least one undesired uncoupled spin resonance. Response signals are acquired within a gating period including a temporal point thereof occurring at a time interval T after the temporal midpoint of the final .pi. RF signal pulse. The pair of recovered sets of data are substracted from one another to obtain a final data set in which noncoupled spin resonance data is substantially cancelled but desired coupled spin resonance data is preserved.

REFERENCES:
patent: 4068161 (1978-01-01), Ernst
patent: 4345207 (1982-08-01), Bertrand
patent: 4521732 (1985-06-01), Pegg et al.
patent: 4581582 (1986-04-01), Redington

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