Method of exciting a sample for NMR tomography

Details Method of exciting a sample for NMR tomography Method of exciting a sample for NMR tomography

1991-11-21

1993-09-28

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

052489426

ABSTRACT:
In particular with 3D tomography, it is necessary to acquire a large number of individual spectra. Therefore it is advisable to reduce the time needed for the acquisition of a single spectrum without loosing too much in signal-to-noise ratio. To a significant extent, this time is determined by the relaxation time of the spins. Prior to each excitation a significant quantity of these spins have to return into their equilibrium (z-direction of the homogeneous magnetic field) in order to create a usable signal with the next excitation. For spins with long relaxation times T.sub.2 this time can be reduced by a -90.degree. pulse 12 that coincides with the center of the last spin echo 9 with appropriate application of the gradient fields. This -90.degree. pulse returns the x-y magnetization that exists in the x-y plane into the z-direction. The diagnostic relevance can be significantly increased by such a procedure.

REFERENCES:
patent: 4595899 (1986-06-01), Smith et al.
patent: 4692704 (1987-09-01), Gray
"Experimental Pulse NMR, A Nuts and Bolts Approach", E. Fukushima, S. Roeder, Addison Wesley, MA, 1981.
"Pulse and Fourier Transform NMR", T. C. Farrar, E. D. Becker, Academic Press, 1971.

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