Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 65, Issue 6, Pages 1724-1732Publisher
WILEY
DOI: 10.1002/mrm.22754
Keywords
prospective motion correction; retrospective motion correction; Kalman filtering; tracking accuracy; real-time; conjugate gradient method
Funding
- German Federal Ministry of Education and Research (INU-MAC) [01EQ0605]
- NIDA [1R01 DA021146]
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Prospective motion correction can prevent motion artifacts in magnetic resonance imaging of the brain. However, for high-resolution imaging, the technique relies on precise tracking of head motion. This precision is often limited by tracking noise, which leads to residual errors in the prospectively-corrected k-space data and artifacts in the image. This work shows that it is possible to estimate these tracking errors, and hence the true k-space sample locations, by applying a two-sided filter to the tracking data after imaging. A conjugate gradient reconstruction is compared to gridding as a means of using this information to retrospectively correct for the effects of the residual errors. Magn Reson Med 65:1724-1732, 2011. (C) 2011 Wiley-Liss, Inc.
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