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Corticospinal Excitability Modulation During Action Observation
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Interactions between head motion and coil sensitivity in accelerated fMRI.

Z Faraji-Dana1, F Tam2, J J Chen3

  • 1Department of Medical Biophysics, University of Toronto, Toronto, Canada; Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, Toronto, Canada.

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|June 12, 2016
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Head motion during fMRI scans can cause artifacts in parallel imaging. Updating coil sensitivity maps mitigates these motion-induced artifacts, improving functional MRI data quality.

Keywords:
ArtifactCoils sensitivity mapsGRAPPAHead motionParallel imagingSENSE

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Area of Science:

  • Neuroimaging
  • Medical Physics

Background:

  • Parallel imaging accelerates functional MRI (fMRI) acquisition using multi-channel coils.
  • Head motion during fMRI can cause artifacts due to non-uniform coil sensitivity.

Purpose of the Study:

  • Investigate the impact of head motion on parallel imaging fMRI.
  • Determine if updating coil sensitivities can mitigate motion artifacts.

Main Methods:

  • Numerical simulations of SENSE and GRAPPA parallel imaging schemes.
  • fMRI scans with and without head motion at acceleration factors 2 and 4.
  • Comparison of fMRI data with updated versus reference coil sensitivity maps.

Main Results:

  • Updating coil sensitivities significantly improved standard deviation and activation maps in the presence of head motion.
  • Simulations characterized the conditions under which updating coil sensitivities is beneficial.

Conclusions:

  • Head motion negatively impacts parallel imaging fMRI quality.
  • Updating coil sensitivity maps effectively mitigates motion-induced artifacts, enhancing fMRI data reliability.