Magnetic resonance imaging method and apparatus employing a static magnetic field having a predetermined inhomogeneity in one spatial direction
US5739688A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Mar 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3808
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a magnetic resonance tomography pulse sequence, a slice perpendicular to the spatial direction of an inhomogeneity in the static field is first excited. The nuclear spins are re-phased and spin echo signals are readout under a gradient in a second direction. A phase-encoding gradient is activated between the excitation and the readout of the nuclear spins. A predetermined inhomogeneity in the static magnetic field is permanently present and acts during the overall pulse sequence as a permanent magnetic field gradient. With this pulse sequence, an inhomogeneity in two spatial directions can be allowed, which simplifies the construction of a magnet considerably and improves the access to the subject under examination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.