Format

Send to:

Choose Destination
See comment in PubMed Commons below
Magn Reson Med. 2013 Mar 1;69(3):734-48. doi: 10.1002/mrm.24309. Epub 2012 May 14.

Real-time correction by optical tracking with integrated geometric distortion correction for reducing motion artifacts in functional MRI.

Author information

  • 1Rotman Research Institute, Baycrest, Toronto, Canada. djrotenberg@gmail.com

Abstract

Head motion artifacts are a major problem in functional MRI that limit its use in neuroscience research and clinical settings. Real-time scan-plane correction by optical tracking has been shown to correct slice misalignment and nonlinear spin-history artifacts; however, residual artifacts due to dynamic magnetic field nonuniformity may remain in the data. A recently developed correction technique, Phase Labeling for Additional Coordinate Encoding, can correct for absolute geometric distortion using only the complex image data from two echo planar images with slightly shifted k-space trajectories. An approach is presented that integrates Phase Labeling for Additional Coordinate Encoding into a real-time scan-plane update system by optical tracking, applied to a tissue-equivalent phantom undergoing complex motion and an functional MRI finger tapping experiment with overt head motion to induce dynamic field nonuniformity. Experiments suggest that such integrated volume-by-volume corrections are very effective at artifact suppression, with potential to expand functional MRI applications.

Copyright © 2012 Wiley Periodicals, Inc.

PMID:
22585554
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for John Wiley & Sons, Inc.
    Loading ...
    Write to the Help Desk