Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1995-10-03
1996-10-29
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
055700195
ABSTRACT:
A nuclear magnetic resonance pulse sequence to provide spectral encoding so that the resulting series of spin-echoes each include both spatial and spectral information for spectroscopic imaging. Atoms within the object are excited and may then be spatially encoded, as by a phase encoding gradient. A series of refocusing pulses is then applied, inducing a respective series of spin-echoes. Spectral information is directly encoded in the spin-echo signals. The multiple spin-echoes may be used for sampling different points of k-space, and/or for increasing the signal-to-noise ratio by averaging. In an alternative embodiment, the present invention produces compound weighted spectroscopic images by selecting the period between refocussing pulses according to the coupling constant of a group contained in the compound; thereby, the signal of the selected compounds modulate with a known frequency different for compounds with different coupling constants.
REFERENCES:
patent: 4628262 (1986-12-01), Maudsley
patent: 4698592 (1987-10-01), Feinberg
patent: 4965520 (1990-10-01), Sakamoto
patent: 5072182 (1991-12-01), Derby et al.
patent: 5089784 (1992-02-01), Yoshitome et al.
Duyn Jeff
Moonen Chrit T. W.
Arana Louis M.
The United States of America as represented by the Department of
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