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Echo-Planar Imaging With Prospective Slice-by-Slice Motion Correction Using Active Markers
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DOI：10.1002/mrm.22780.png)
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摘要
En 中文
Head motion is a fundamental problem in functional magnetic resonance imaging and is often a limiting factor in its clinical implementation. This work presents a rigid-body motion correction strategy for echo-planar imaging sequences that uses micro radiofrequency coil active markers' for real-time, slice-by-slice prospective correction. Before the acquisition of each echo-planar imaging-slice, a short tracking pulse-sequence measures the positions of three active markers integrated into a headband worn by the subject; the rigid-body transformation that realigns these markers to their initial positions is then fed back to dynamically update the scan-plane, maintaining it at a fixed orientation relative to the head. Using this method, prospectively-corrected echo-planar imaging time series are acquired on volunteers performing in-plane and through-plane head motions, with results demonstrating increased image stability over conventional retrospective image-realignment. The benefit of this improved image stability is assessed in a blood oxygenation level dependent functional magnetic resonance imaging application. Finally, a non-rigid-body distortion-correction algorithm is introduced to reduce the remaining signal variation. Magn Reson Med 66:73-81, 2011. (C) 2011 Wiley-Liss, Inc.
Keyword:
functional magnetic resonance imaging
fMRI
EPI
motion correction
prospective
real-time
active marker
device tracking
RF-coil
microcoil
geometric distortion
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3
论文数:
1.2W
被引数:
3.1W
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