Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 68, Issue 2, Pages 430-440Publisher
WILEY-BLACKWELL
DOI: 10.1002/mrm.23245
Keywords
diffusion; phase; motion; diffusion-weighted imaging
Funding
- Center of Advanced MR Technology at Stanford [P41RR09784, 1 R01 EB008706, 1 R01 EB008706 S1, 5 R01 EB002711, 1 R01 EB006526, 1 R21 EB006860]
- Lucas Foundation
- Oak Foundation
- GE Healthcare
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In diffusion-weighted imaging, multishot acquisitions are problematic due to intershot inconsistencies of the phase caused by motion during the diffusion-encoding gradients. A model for the motion-induced phase errors in diffusion-weighted-MRI of the brain is presented, in which rigid-body and nonrigid-body motion are separated. In the model, it is assumed that nonrigid-body motion is due to cardiac pulsation, and that the motion patterns are repeatable from beat-to-beat. To test the validity of this assumption, the repeatability of nonrigid-body motion-induced phase errors is quantified in three healthy volunteers. Nonrigid-body motion-induced phase was found to significantly correlate (P < 0.05) with pulse-oximeter waveforms in similar to 83% of the pixels tested across all slices and subjects. Magn Reson Med, 2012. (C) 2011 Wiley Periodicals, Inc.
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