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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
09:33

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Published on: July 28, 2013

Effect of head size on diffusion tensor imaging.

Hidemasa Takao1, Naoto Hayashi, Sachiko Inano

  • 1Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan. takaoh-tky@umin.ac.jp

Neuroimage
|May 25, 2011
PubMed
Summary
This summary is machine-generated.

Total intracranial volume significantly impacts brain diffusion tensor measures like fractional anisotropy (FA) and mean diffusivity (MD). Researchers recommend controlling for head size in analyses when comparing groups with differing volumes.

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Area of Science:

  • Neuroimaging
  • Radiology
  • Brain Anatomy

Background:

  • Head size varies considerably among individuals.
  • No prior studies systematically examined head size effects on brain diffusion tensor measures.
  • Understanding these effects is crucial for accurate neuroimaging analysis.

Purpose of the Study:

  • To investigate the influence of head size, specifically total intracranial volume (TIV), on diffusion tensor imaging (DTI) metrics.
  • To evaluate the relationship between TIV and fractional anisotropy (FA) and mean diffusivity (MD).

Main Methods:

  • Utilized tract-based spatial statistics (TBSS) on data from 821 healthy subjects (304 females, 517 males).
  • Analyzed the correlation between TIV and DTI measures (FA and MD).
  • Assessed potential interactions between TIV and sex.

Main Results:

  • Significant correlations were found between TIV and FA/MD in multiple brain regions.
  • No significant interaction effect was observed between TIV and sex.
  • TIV was identified as a significant factor influencing FA and MD.

Conclusions:

  • Total intracranial volume substantially affects diffusion tensor measures (FA and MD).
  • Potential contributing factors include partial volume effects and head-size-related micro-architectural differences.
  • Controlling for TIV in statistical analyses may be necessary when comparing groups with disparate intracranial volumes.