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Tests of cortical parcellation based on white matter connectivity using diffusion tensor imaging.

Yurui Gao1, Kurt G Schilling1, Iwona Stepniewska2

  • 1Institute of Imaging Science, Vanderbilt University, United States; Department of Biomedical Engineering, Vanderbilt University, United States.

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Summary

Diffusion tensor imaging (DTI) parcellation of the brain’s cortex shows differences compared to traditional histological methods. DTI tractography may reflect functional networks rather than direct cytoarchitectural mapping.

Keywords:
ClassificationCortical parcellationCross-validationDTI tractographyWhite matter connectivity

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Area of Science:

  • Neuroscience
  • Comparative Anatomy
  • Brain Imaging

Background:

  • The cerebral cortex is traditionally segmented by cytoarchitectural features.
  • Diffusion tensor imaging (DTI) offers noninvasive cortical parcellation via white matter connectivity.
  • The relationship between DTI-based and cytoarchitectural parcellations remains unclear.

Purpose of the Study:

  • To systematically compare histological and DTI-connectivity-based parcellations of the New World monkey neocortex.
  • To evaluate the accuracy of DTI-based cortical parcellation using supervised classification and unsupervised clustering.
  • To identify discrepancies and underlying principles driving DTI-connectivity-based parcellation.

Main Methods:

  • Histological parcellation using Nissl staining for cytoarchitectural reference.
  • DTI tractography for white matter connectivity mapping.
  • Supervised classification and unsupervised clustering of DTI data for cortical parcellation.
  • Comparison of DTI-derived parcellations with histological standards.

Main Results:

  • Supervised classification achieved reasonable performance in parcellating parieto-frontal cortex based on DTI tractograms and cytoarchitectural priors.
  • Unsupervised clustering revealed differences between DTI-connectivity and Nissl-defined domains.
  • DTI tractograms tended to cluster according to functional networks, not directly mapping to cytoarchitectural areas.

Conclusions:

  • DTI-based parcellation may be influenced by DTI's bias towards prominent white matter bundles.
  • Discrepancies suggest that DTI-connectivity and cytoarchitectural domains represent distinct organizational principles.
  • Caution is advised when using DTI tractography for cytoarchitectural parcellation, especially across different brains.