Apparatus and method for decreasing magnetic field sensitivity of long RF pulses
US5488298A · kind A · utility
6Cited by
13References
29Claims
0Family size
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Key dates
| Filing date | Dec 6, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | Dec 6, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/446
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A long RF pulse is segmented into a plurality of RF pulses segments with nuclei spin refocusing pulses provided after each RF pulse segment to maintain phase coherence off resonance and decrease nuclei spin sensitivity to magnetic field inhomogeneity. The refocusing pulses are preferably 180.degree. rectangular pulses. Magnetic gradient segments associated with the RF pulse segments have supplemental gradients at the beginning and at the end of the gradient segment to ensure that the position in k-space for the segment corresponds to the k-space position of the gradient waveform before division into segments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.