Suppression of oscillations in NMR measurement using off-resonan

Details Suppression of oscillations in NMR measurement using off-resonan Suppression of oscillations in NMR measurement using off-resonan

1993-08-13

1995-05-30

Wieder, Kenneth A.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324300, G01R 3320

Patent

active

054205107

ABSTRACT:
Oscillations in longitudinal magnetization as a spin system recovers from a 180.degree. inversion pulse in the presence of off-resonance spin-locking pulse are eliminated by tipping the magnetization prior to spin-locking by an amount .theta. and tipping it back by an amount -.theta. after spin-locking. A one-shot measurement of off-resonance relaxation constant T.sub.1.rho. employs the .+-..theta. pulses to improve accuracy and a T.sub.1.rho. enhanced imaging sequence employs the .+-..theta. pulses to reduce artifacts.

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patent: 4742303 (1988-05-01), Bendall
patent: 4820983 (1989-04-01), Bendall
patent: 4887034 (1989-12-01), Smith
patent: 5001427 (1991-03-01), Fujiwara
patent: 5281917 (1994-01-01), Santyr
Time Saving in Measurement of NMR and EPR Relaxation Times*, The Review of Science Instruments, vol. 41, No. 2, pp. 250-251, Feb. 1970, D. C. Look & D. R. Locker.
A Comparison of One-Shot and Recovery Methods in T1 Imaging, Magnetic Resonance in Medicine 7, 23-24 (1988) A. P. Crawley & R. M. Henkelman.

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