Method and apparatus for obtaining nuclear magnetic resonance spectra
US4727324A · kind A · utility
Inventors
Key dates
| Filing date | Jul 29, 1985 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Jul 29, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4831
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of obtaining a localized nuclear magnetic reasonance signal from a sample using a radiofrequency irradiation coil which provides an inhomogeneous radiofrequency field, comprises PA0 applying to the sample a plurality of radiofrequency pulse sequences, each pulse sequence including an excitation pulse, and at least two other pulses, the pulse sequences differing only in the phase of one or more of the said other pulses, and the phases of at least two of the said other pulses being shifted by 180.degree. in selected sequences of the said plurality, the number of sequences in the said plurality being such that a sequence exists for each possible combination of the said phase shifts for each of the said other pulses, and there being no sequences in the said plurality in which the phases of the said at least two of the said other pulses is shifted by 90.degree., PA0 acquiring an N.M.R. signal after each pulse sequence, PA0 and combining the N.M.R. signals obtained to produce a localized N.M.R. signal from selected regions of the sample. The method may be used in any N.M.R. method in which localization is desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.