Method and apparatus for reducing artifacts in echo planar imaging
US6259250A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1999 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | Apr 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56554
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A technique is described for correcting phase errors in a bipolar readout gradient MRI imaging sequence, such as an EPI examination. The technique employs alternating sets of oscillating readout gradient pulses. Each readout pulse train has a polarity which is inverted with respect to an immediately preceding and an immediately succeeding readout sequence. The collected data then incorporates both image data and data which is used to correct for phase errors. Following data acquisition, correction factors may be determined from the k-space frames for correction of successive k-space data. K-space frames may be reformatted to inherently correct for phase errors, followed by combination of hybrid k-space data frames to obtain a corrected image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.