NMR apparatus compensated for primary field changes
US4684889A · kind A · utility
15Cited by
4References
2Claims
0Family size
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Key dates
| Filing date | Apr 4, 1985 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Apr 4, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56563
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An object which can provide a reference for measuring the intensity of a primary magnetic field, is positioned in the vicinity of a subject being examined. A variation in the primary magnetic field intensity is detected, based on a frequency shift of data observed of the object, and is used to control the primary magnetic field intensity, or reference frequency for phase detection, or to correct image data. In this manner image quality is prevented from being degraded due to the variation of the primary magnetic field intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.