Positive contrast MRI using positive and negative field inhomogeneity
US7480525B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2006 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Sep 19, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/5601
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The acquisition of multiple images at slightly different time shifts from the spin echo (or from TE=0 for gradient echo sequences), allows the separation of on-resonance spins from off-resonance spins by encoding this information in the received signal. The excitation pulse can be a standard broadband excitation that will excite all spins. The separation of on- and off-resonance spins is then performed on the received signal. The polar and equatorial lobes of a magnetic particle such as SPIO produce signals from excited water molecules near the particle which are frequency offset above and below the frequency of signals from water molecules unaffected by the particle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.