Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 66, Issue 2, Pages 366-378Publisher
WILEY
DOI: 10.1002/mrm.22787
Keywords
motion; DTI; diffusion; real-time motion correction; optical motion correction; prospective motion correction
Funding
- NIH [1R01EB008706, 5R01EB002711, 1R01EB006526, 1R21EB006860]
- Center of Advanced MR Technology at Stanford [P41RR09784]
- Lucas Foundation
- Oak Foundation
- GE Healthcare
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Head motion is a fundamental problem in brain MRI. The problem is further compounded in diffusion tensor imaging because of long acquisition times, and the sensitivity of the tensor computation to even small misregistration. To combat motion artifacts in diffusion tensor imaging, a novel real-time prospective motion correction method was introduced using an in-bore monovision system. The system consists of a camera mounted on the head coil and a self-encoded checker-board marker that is attached to the patient's forehead. Our experiments showed that optical prospective motion correction is more effective at removing motion artifacts compared to image-based retrospective motion correction. Statistical analysis revealed a significant improvement in similarity between diffusion data acquired at different time points when prospective correction was used compared to retrospective correction (P < 0.001). Magn Reson Med 66:366-378, 2011. (C)2011 Wiley-Liss, Inc.
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