NMR machine with low field and dynamic polarization
US5208533A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1991 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Mar 29, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/381
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Problems of homogeneity of the resonant field of an NMR machine are solved by differentiating the polarization and resonance functions assigned to coils of the field of said machine. In order to produce a magnetization, use is made of a polarization coil which produces a high field. This polarization field does not need to be homogeneous. Before making measurements, during sequences of excitation-measurement of the electromagnetic wave within the body under examination, the polarization field is switched in order to be cancelled and the body is subjected to a resonance field. This resonance field can be of much lower strength but is on the other hand much more homogeneous. By thus making use of switching of the orienting field, it is shown that the signal-to-noise ratio of the detected signal is maintained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.