Through time GRAPPA
US9069051B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jul 13, 2012 |
| Grant date | Jun 30, 2015 |
| Priority date | — |
| Expiry date | Nov 15, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/56308
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Example apparatus and methods control a magnetic resonance imaging (MRI) apparatus to acquire, from an object to be imaged, throughout a period of time, a partitioned non-Cartesian fully-sampled calibration data set. Different groups of lines in the calibration data set are acquired at different points in time under different gradient encoding conditions that yield phase encoding in the direction perpendicular to the non-Cartesian encoded plane. The MRI apparatus is controlled to acquire an under-sampled non-Cartesian data set from the object to be imaged and to reconstruct an image from the under-sampled data set based, at least in part, on a through-time GRAPPA calibration. A GRAPPA weight set can be computed from data in different groups of lines in the calibration data set because different groups of lines can be treated as unique calibration time frames due to phase encoding produced by the different gradient encoding conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.