Quadrature detection circuit for nuclear magnetic resonance apparatus
US4734648A · kind A · utility
6Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1987 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Mar 30, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3621
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A quadrature detection circuit compensates for phase and amplitude differences in an NMR quadrature detection apparatus. The quadrature detection circuit comprises a test signal generator, first and second modulators, amplitude detectors, phase error detectors and a corrector. The corrector compensates the NMR signal as to phase and amplitude factors determined during an initial calibration mode utilizing the test signals, thus eliminating ghost images of the object which would otherwise be formed during image reconstruction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.