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Spurious group differences due to head motion in a diffusion MRI study.

Anastasia Yendiki1, Kami Koldewyn2, Sita Kakunoori1

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Neuroimage
|November 26, 2013
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Summary
This summary is machine-generated.

Head motion significantly impacts diffusion-weighted MRI (DW-MRI) findings in group studies. Accounting for head motion is crucial for accurate comparisons of white matter microstructure, especially in pediatric populations.

Keywords:
AutismDiffusion MRIMotionTractography

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Developmental Neuroscience

Background:

  • Diffusion-weighted MRI (DW-MRI) is vital for assessing white matter microstructure in vivo.
  • DW-MRI's sensitivity to water molecule motion makes it vulnerable to head motion artifacts.
  • Existing correction methods often fail to fully address head motion's impact on DW-MRI contrast.

Purpose of the Study:

  • To investigate the influence of head motion on diffusion MRI measures in children with autism versus typically developing children.
  • To determine if group differences in head motion can create spurious group differences in diffusion MRI metrics.
  • To evaluate strategies for mitigating head motion effects in population-based DW-MRI studies.

Main Methods:

  • Utilized DW-MRI data from pediatric cohorts (autism and typically developing).
  • Analyzed anisotropy and diffusivity measures, correlating them with head motion.
  • Employed statistical models including motion as a nuisance regressor.

Main Results:

  • Group differences in head motion were shown to induce artificial group differences in DW-MRI measures.
  • These motion-induced effects were observed even in control-only comparisons.
  • Motion effects varied across white matter pathways and could be reduced by including motion as a covariate.

Conclusions:

  • Head motion is a critical confounder in population-based DW-MRI studies.
  • Failure to account for differential head motion can lead to erroneous conclusions about white matter differences.
  • Future DW-MRI research must incorporate robust motion assessment and correction strategies.