Translation First PROPELLER MRI Correction
Vanderbilt University Institute of Imaging Science
PROPELLER MRI is a well-known approach for correction of multi-shot axial T2W images corrupted by in-plane rigid body motion. The standard PROPELLER correction algorithm compensates for in-plane rotation before in-plane translation; however, it is possible to correct in-plane translation first using center of mass consistency properties. This allows the use of complex k-space values (instead of magnitude only) in the subsequent rotation correction step. This improves rotation detection accuracy and enables the detection of all alignments over the full 360 range impossible using only magnitude k-space data.