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Mapping Human Corpus Callosum Connectivity With Diffusion Spectrum Imaging: A Deterministic Tractography Approach.

Chao Zhang1,2,3, Jian-Wei Shi1,2,3, Zhen-Ming Wang4,5

  • 1Department of Neurosurgery, Xuanwu Hospital, Capital Medical University, Beijing, China.

Brain and Behavior
|March 13, 2026
PubMed
Summary

This study created a detailed brain atlas of the corpus callosum (CC) using diffusion spectrum imaging (DSI). The atlas maps CC connectivity, enhancing understanding of interhemispheric communication for clinical use.

Keywords:
corpus callosumdeterministic tractographydiffusion spectrum imagingtranscallosal tracts

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Area of Science:

  • Neuroimaging
  • Neuroanatomy
  • Brain Connectivity

Background:

  • The corpus callosum (CC) is crucial for interhemispheric communication.
  • High-resolution mapping of CC subregions is needed for clinical applications.

Purpose of the Study:

  • To create a high-resolution atlas of the corpus callosum (CC).
  • To detail CC subregional connectivity using diffusion spectrum imaging (DSI).
  • To improve understanding of interhemispheric communication for clinical applications.

Main Methods:

  • Diffusion spectrum imaging (DSI) was used on 44 healthy individuals.
  • Quantitative anisotropy (QA)-based deterministic fiber tracking mapped CC connectivity.
  • Connectivity was correlated with cortical subregions from AAL and BNA atlases.

Main Results:

  • Identified 41 AAL and 101 BNA regions in the CC midsagittal plane.
  • Mapped frontal, motor/sensory, and temporal projection subregions within the CC.
  • Revealed complex, heterogeneous CC connectivity reflecting diverse structural and functional roles.

Conclusions:

  • Developed the first extensive CC atlas integrating anatomical and functional connectivity.
  • Utilized QA-based DSI deterministic tractography for mapping.
  • The freely available atlas offers insights for neuroscience research and clinical practice.