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Image distortion correction in fMRI: A quantitative evaluation.

Chloe Hutton1, Andreas Bork, Oliver Josephs

  • 1Wellcome Department of Cognitive Neurology, Institute of Neurology, London WCIN 3BG, United Kingdom.

Neuroimage
|April 24, 2002
PubMed
Summary
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Geometric distortion in functional magnetic resonance imaging (fMRI) using echo-planar imaging (EPI) complicates anatomical registration. This study evaluates distortion correction methods, finding dual echo-time EPI sequences effective for generating field maps but not for time-varying distortions.

Area of Science:

  • Neuroimaging
  • Medical Physics

Background:

  • Echo-planar imaging (EPI) is standard for functional magnetic resonance imaging (fMRI) but suffers from geometric distortions due to magnetic field inhomogeneity.
  • These distortions hinder accurate registration between functional activation maps and high-resolution anatomical images.

Purpose of the Study:

  • To quantitatively evaluate image distortion correction techniques for fMRI at 2 Tesla.
  • To assess methods for acquiring and calculating field maps.
  • To investigate the impact of distortion correction on anatomical-functional image coregistration and the interaction with head motion.

Main Methods:

  • Utilized a dual echo-time EPI sequence for field map acquisition.
  • Assessed the effect of distortion correction on the spatial alignment of anatomical and functional MRI data.

Related Experiment Videos

  • Quantified the interplay between head motion and geometric distortion.

    • Main Results:

    • Dual echo-time EPI sequences can generate field maps with acceptable noise levels for distortion correction.
    • Image distortion correction significantly improves anatomical-functional coregistration, even for minor distortions.
    • While field maps can characterize motion-distortion interactions, their temporal variance is not ideal for correcting time-varying distortions.

    Conclusions:

    • Distortion correction is crucial for accurate anatomical registration in fMRI.
    • Dual echo-time EPI is a practical method for acquiring field maps.
    • Correcting for time-varying distortions using successively measured field maps is not recommended due to introduced variance.