Nuclear magnetic resonance imaging method and device
US6541970B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Jun 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56554
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a multi-shot MR imaging method, a navigator echo V(kx, n) of which phase-encoding amount is 0 is generated by applying a gradient magnetic field pulse in a readout direction (x-direction) and collected at each segment. A phase shift map C(kx, n) of V(kx, n) collected in the n-th segment is produced in k-space as a function in kx-direction with V(kx, 1) collected in the first segment being the reference. Next, noises are removed from C(kx, n), and C(kx, n) is smoothed. Then, an image echo signal S(kx, n, m) collected in the n-th segment is corrected in k-space according to a smoothed phase shift map C′(kx, n) of V(kx, n) collected in the same segment, and an image echo signal S′(kx, n, m) of which phase shifts are corrected is thereby acquired. Thus, the phase shifts of the image echo signals caused by a motion in the x-direction of a patient can be precisely corrected at a high speed. By reconstructing an image with the corrected image echo signal S′(kx, n, m), the image without motion artifacts can be acquired in realtime.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.