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Charting the Normal Development of Structural Brain Connectivity in Utero using Diffusion MRI.

Davood Karimi1, Bo Li1, Athena Taymourtash2

  • 1Department of Radiology, Harvard Medical School and Boston Children's Hospital, Boston, Massachusetts, USA.

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Summary

This study maps fetal brain connectivity using diffusion-weighted MRI (dMRI) in 198 fetuses. It reveals key developmental periods and establishes a normative map for understanding brain development and disorders.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Medical Imaging

Background:

  • Fetal brain structural connectivity is crucial for neural function and development.
  • Diffusion-weighted MRI (dMRI) is key for mapping brain networks but faces fetal application challenges.
  • Limited data and technical hurdles have constrained in utero brain connectivity studies.

Purpose of the Study:

  • To present the largest in utero brain connectivity study to date.
  • To characterize developmental trajectories of fetal brain structural connectomes.
  • To introduce novel methods for fetal connectome analysis and template construction.

Main Methods:

  • Analysis of high-quality dMRI data from 198 fetuses (22-37 weeks gestation).
  • Application of advanced fetal-specific tools for segmentation, parcellation, and tractography.
  • Graph-theoretical analysis and fiber bundle capacity for weighted connections; development of age-specific connectome templates.

Main Results:

  • Consistent increases in brain network integration and segregation across gestation.
  • Identification of a critical window (27.5-30.5 weeks) for rapid connectivity strengthening.
  • Novel template construction method outperforms traditional approaches, enabling accurate age prediction.

Conclusions:

  • Provides a normative map of fetal brain structural connectivity.
  • Establishes a foundation for studying atypical development and neurological risks.
  • Highlights the importance of advanced dMRI analysis for understanding early brain development.