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Prospective multiaxial motion correction for fMRI.

H A Ward1, S J Riederer, R C Grimm

  • 1Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905, USA.

Magnetic Resonance in Medicine
|March 22, 2000
PubMed
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This study introduces a real-time prospective correction method for head motion during functional MRI (fMRI). The technique significantly improves fMRI activation detection by correcting motion during image acquisition.

Area of Science:

  • Neuroimaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Head motion during functional MRI (fMRI) corrupts image time series, limiting clinical utility.
  • Accurate motion correction is crucial for reliable fMRI data analysis and interpretation.

Purpose of the Study:

  • To develop and validate a real-time prospective correction method for six degrees of rigid body motion in fMRI.
  • To assess the accuracy and efficacy of the proposed motion correction technique in both phantom and in vivo studies.

Main Methods:

  • Incorporation of an orbital navigator (ONAV) echo in sagittal, axial, and coronal planes into the fMRI pulse sequence.
  • Real-time measurement of rotation and translation, followed by prospective correction of image acquisition orientation.
  • Testing using a computerized motion phantom and in vivo fMRI experiments.

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Main Results:

  • Achieved subdegree rotational and submillimeter translational accuracy over +/-8 degrees and +/-8 mm motion ranges.
  • Demonstrated successful correction of simultaneous through-plane and in-plane motion in vivo.
  • Showed improved detection of fMRI activation in the presence of head motion.

Conclusions:

  • The developed real-time prospective motion correction method enhances the clinical utility of fMRI.
  • This technique offers a promising solution for mitigating motion artifacts and improving the reliability of fMRI studies.