NMR imaging system using field compensation
US4685468A · kind A · utility
Inventor
Key dates
| Filing date | Mar 18, 1983 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Mar 18, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56563
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
NMR imaging is achieved in the presence of temporal variations in the magnetic field. The volume is excited using broadband excitation. A signal is picked up in the plane of interest, using a small coil, and used to determine the frequency of the subsequent plane-selecting excitation. A similar coil can be used to pick up the signal used to image the plane using projections all in the same direction. This latter signal is used to provide the demodulation signals to decompose the selected plane into its constituent elements. In both cases, involving the excitation and decoding signals, drifts in the magnetic field are compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.