Selective material projection imaging system using nuclear magnetic resonance
US4577152A · kind A · utility
Inventor
Key dates
| Filing date | Apr 11, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Apr 11, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/561
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Two-dimensional projection measurements are formed of the NMR activity within a volume. Measurements are made using different intensities of the main magnetic field, using the different dependencies of relaxation times on magnetic field. The projection measurements are combined to obtain projection images of specific materials within the volume. Projection images are obtained of specific regions within the volume by insuring that the unwanted regions remain insensitized. For improved SNR, projection measurements are repeated to obtain spin-echo signals. The measurements of relaxation times are interleaved so that the data acquisition can occur rapidly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.