Method and device for determining an NMR distribution in a regio

Details Method and device for determining an NMR distribution in a regio Method and device for determining an NMR distribution in a regio

1985-04-30

1987-11-17

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

307268, 324310, 324322, G01R 3320

Patent

active

047076593

ABSTRACT:
The method and device for NMR Fourier zeugmatography utilizes amplitude-modulated r.f. pulses (90.degree. and 180.degree. pulses) for the excitation of nuclear spins and the generating of nuclear spin echo signals. For three-dimensional Fourier zeugmatography, r.f. pulse having a large bandwidth (for example 10-50 kHz) are desired. The use of amplitude-modulated signals then implies an undesirably high peak power of the r.f. generator. In accordance with the invention, use is made of a frequency-modulated signal which can have a substantially constant amplitude and which preferably covers the desired frequency spectrum at a uniform speed.

REFERENCES:
patent: 3975675 (1976-08-01), Dunand et al.
patent: 4070611 (1978-01-01), Ernst
patent: 4319190 (1982-03-01), Brown
patent: 4486708 (1984-12-01), Macovski
patent: 4506222 (1985-03-01), Edelstein et al.
patent: 4521749 (1985-06-01), Lockhart
patent: 4540958 (1985-09-01), Neyens et al.
Abstracts, 17th Experimental NMR Conference, "Chirp Pulse NMR Spectroscopy", J. Delayre et al, Apr. 1976, pp. 5-9.

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