Nuclear magnetic resonance methods
US4509015A · kind A · utility
Inventors
Key dates
| Filing date | Sep 16, 1982 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Sep 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5616
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This invention provides methods of investigating a body by nuclear magnetic resonance. Nuclear magnetic resonance is preferentially excited in a slice of the body and the resulting free induction decay signals are detected in the presence of a magnetic field having first and second gradients (G.sub.y, G.sub.x). In one proposed method two experiments are performed in which the phase of the first gradient (G.sub.y) reversal is opposite, and the detected signals from the two experiments are edited to obtain a set of signals, for Fourier transformation, occurring when the first gradient has one sense. Two such sets may be obtained, one for each sense of the first gradient, and the data obtained after Fourier transformation re-ordered and added. In a second proposed method the second gradient (G.sub.x) is applied only when the first gradient (G.sub.y) has a given sense, and the free induction decay signals obtained when both gradients are present, and when only the first gradient is present, are separately processed. In a third proposed method, the first gradient (G.sub.y) is temporarily removed before each reversal of its sense, and the second gradient (G.sub.x) is reversed while the f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.