Brian Robert Keating1,
Thomas Ernst2
1Department
of Medicine, Unversity of Hawaii, Honolulu, HI, United States; 2Department
of Medicine, University of Hawaii at Manoa, Honolulu, HI, United States
Subject motion introduces unwanted phase variance in the MR signal, resulting in image/spectral artifacts. We performed single-voxel brain scans (PRESS) while subject head movement was monitored by an external optical tracking system. The motion-induced phase evolution was estimated based on tracking data and knowledge of the gradient waveforms. Phase corrections were applied in post-processing, resulting in improved phase coherence and increased SNR on real spectra. These results demonstrate the promise of a high-accuracy motion tracking system for reducing movement-related artifacts in phase-sensitive modalities.