NMR image forming apparatus
US4663592A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 28, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | May 28, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/565
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The static magnetic fields of an NMR imaging apparatus should be maintained constant in intensity in order to obtain satisfactory NMR images. Coils used to generate the static magnetic fields, and the supporting frames therefor, are subject to heat expansion due to changes in the temperature, which causes fluctuations in the intensity of the generated static magnetic fields. In the invention, the temperatures of the coils, frames, atmosphere and cooling water, and the amount of cooling water, are detected, and the energizing current for the static magnetic field coils is selectively controlled, based on the detected quantities, to thereby maintain constant the intensity of the generated static magnetic fields.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.