Abstract #1016

Selective MRI reacquisition to extend the working range of retrospective motion correction

Malte Laustsen^1,2, Jakob Slipsager², Thomas Gaaß², Robert Frost^3,4, André van der Kouwe^3,4, Melanie Ganz^5,6, and Lars G. Hanson¹

¹Magnetic Resonance Section, DTU Health Tech, Technical University of Denmark, Kgs. Lyngby, Denmark, ²TracInnovations, Ballerup, Denmark, ³Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ⁴Department of Radiology, Harvard Medical School, Boston, MA, United States, ⁵Neurobiology Research Unit, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark, ⁶Department of Computer Science, University of Copenhagen, Copenhagen, Denmark

Synopsis

Keywords: Motion Correction, ArtifactsRetrospective motion correction (RMC) can substantially reduce motion artifacts in 3D brain MRI. However, for extensive motion, RMC performance is limited. We evaluate RMC with selective reacquisition (RMC+reacq) to expand the range of correctable motion, while directly comparing to prospective motion correction (PMC) for volumetric brain MRI, using external motion tracking. Both approaches lead to significant image quality improvement and the performance of RMC+reacq and PMC was only found statistically significant in 1 of 9 comparisons. These results suggest that RMC with selective reacquisition can match the performance of PMC for 3D-MPRAGE and 3D-FLAIR sequences.

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