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Evaluating the quality of brainstem ROI registration using structural and diffusion MRI.

Yi-An A Chen1,2, Lars Kasper1,3, Clement T Chow3,4

  • 1Department of Psychology, University of Toronto, Toronto, ON, Canada.

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Summary

Integrating diffusion MRI data significantly improves the accuracy of registering brain regions in the brainstem for functional MRI (fMRI) studies. This diffusion-augmented approach enhances the reliability of BOLD signal analysis in brainstem research.

Keywords:
ROI registrationalignmentbrainstemdiffusion-weighted imaging (DWI)functional MRI reliability

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Area of Science:

  • Neuroimaging
  • Brainstem Anatomy
  • Functional MRI (fMRI)

Background:

  • Accurate registration of regions of interest (ROIs) to native spaces is crucial for fMRI reliability.
  • T1-weighted (T1w) MRI registration is standard for the cortex but performs poorly for the brainstem due to anatomical complexity.
  • Brainstem nuclei are small, densely packed, and poorly visualized on T1w images, limiting registration accuracy.

Purpose of the Study:

  • To investigate if incorporating diffusion MRI data improves ROI registration accuracy in the brainstem.
  • To compare the performance of T1w-only registration pipelines with those augmented by diffusion MRI components.

Main Methods:

  • Developed four registration pipelines: T1w-only and three diffusion-augmented variants.
  • Evaluated registration accuracy using Dice coefficient (red nucleus, substantia nigra) and mis-registration fraction (dorsal raphe nucleus).
  • Utilized fractional anisotropy (FA) images, non-diffusion-weighted (b0) images, and multivariate combinations from diffusion MRI.

Main Results:

  • Diffusion-augmented pipelines significantly outperformed the T1w-only baseline.
  • Probabilistic maps showed improved sensitivity to inter-individual variability with diffusion-augmented methods.
  • Analysis revealed associations between localized deformation and image modality-specific landmarks.

Conclusions:

  • Diffusion-augmented pipelines offer superior brainstem ROI registration compared to T1w-only methods.
  • This improved registration can enhance the robustness of fMRI studies investigating brainstem disorders.
  • The findings highlight the utility of diffusion MRI for precise anatomical localization in neuroimaging.