Process for the excitation of a sample for NMR tomography

Details Process for the excitation of a sample for NMR tomography Process for the excitation of a sample for NMR tomography

1985-04-16

1987-09-29

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

046971483

ABSTRACT:
The use of longer 180.degree. pulse sequences for the generation of spin echos is made possible according to the invention during NMR tomography using the 2d-Fourier transformation process in that the phase coding gradient between each pair of 180.degree. pulses is switched on in such a manner that the dephasing caused between each pair of 180.degree. pulses by the phase coding gradient is twice as great as the dephasing caused before the beginning of the first 180.degree. pulse by the phase coding gradient. The mirror images which appear otherwise when using the known 180.degree. pulse sequences, e.g. the Carr-Purcell-Gill-Meiboom pulse sequence, are avoided by this measure.

REFERENCES:
patent: 4451788 (1984-05-01), Edelstein et al.

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