Method of measuring NMR spin-spin relaxation time (T.sub.2) usin

Details Method of measuring NMR spin-spin relaxation time (T.sub.2) usin Method of measuring NMR spin-spin relaxation time (T.sub.2) usin

1983-01-31

1985-02-26

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324300, G01R 3308

Patent

active

045020078

ABSTRACT:
A method is disclosed for measuring the NMR spin-spin relaxation time (T.sub.2) of nuclei using spin-echos comprising the steps of locating the nuclei in a static magnetic field, applying an RF pulse to the nuclei at the Larmor frequency of the nuclei of sufficient duration to rotate the net magnetic moment of the nuclei 90.degree., waiting a time period tau that is at least the time required for the free induction decay signal to go to zero, applying an RF pulse at the same Larmor frequency to the nuclei of sufficient duration to rotate the net magnetic moment of the nuclei 180.degree., recording the primary echo induced, waiting a time period equal to at least 3 tau, to cause the stimulated echos produced by the inhomogeneities in the RF magnetic field to fall into separate time zones from each other and the primary echo, applying an RF pulse at the same Larmor frequency to the nuclei of sufficient duration to rotate the net magnetic moment of the nuclei another 180.degree. to produce the primary and error stimulated echos, recording the primary and error stimulated echos induced thereby during a time period sufficient to allow the peaks of all of the error stimulated echos and the primary echos to appear in different time slots in the time zone, repeating the last three steps to obtain a series of frames each of which contain a primary echo and error stimulated echos, adding the primary echo and related error stimulated echos in each frame to obtain points on a decay curve indicating T2 relaxation time.

REFERENCES:
patent: 4068161 (1978-01-01), Ernst
patent: 4318043 (1982-03-01), Crooks

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