Method of measuring NMR spin-spin relaxation time (T.sub.2) using spin-echos
US4502007A · kind A · utility
Inventors
Key dates
| Filing date | Jan 31, 1983 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jan 31, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 t…
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