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

David Rotenberg, Mark Chiew, Shawn Ranieri, Fred Tam, Rajiv Chopra, Simon J. Graham

Research output: Contribution to journalArticle

18 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)734-748
Number of pages15
JournalMagnetic resonance in medicine
Issue number3
StatePublished - Mar 1 2013



  • echo planar imaging
  • functional magnetic resonance imaging
  • geometric distortion correction
  • optical tracking
  • real-time motion correction

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this