Automated Method Developed for Mapping Deep Brain White Matter Pathways
Researchers have developed BundleParc, an automated pipeline that segments 97 subcortical and brainstem white matter pathways from diffusion MRI data. These deep brain pathways — supporting functions like movement, reward, sensation, and homeostasis — have historically been underrepresented in large-scale brain connectivity studies. The tool could enable more comprehensive mapping of brain circuits relevant to neurological disease, aging, and brain stimulation therapies.
A team of researchers has adapted BundleParc, a bundle-parcellation neural network architecture, into an automated pipeline capable of identifying and parcellating 97 subcortical and brainstem white matter tracts directly from diffusion MRI scans. The model was trained on a curated dataset derived from the Human Connectome Project, using anatomy-guided tractography, explicit inclusion and exclusion criteria, automated outlier filtering, and manual quality assurance to ensure anatomical accuracy. Unlike existing automated segmentation tools, which have largely focused on large-scale association, projection, and commissural bundles, BundleParc targets compact pathways in the brainstem and subcortex that support basal ganglia, cerebellar, limbic, sensory, and homeostatic functions. The model operates on native-space fiber orientation distributions and was shown to generalize across diverse external datasets spanning development, aging, and neurodegenerative disease cohorts, maintaining performance across varying spatial resolutions and angular sampling parameters. The researchers have released the trained model, a population atlas, reference streamlines, a containerized pipeline, and quality assurance outputs as open resources. This toolset is intended to support research into deep brain circuitry in the context of development, aging, neurological disease, and neuromodulation — including deep brain stimulation targeting.
What's missing
As a preprint, this work has not yet undergone formal peer review. The study does not detail the specific neurodegenerative disease cohorts used for generalization testing.
What different sources said
- bioRxivCenter
Automated Segmentation of Brainstem and Subcortical White Matter: Mapping the Deep Tegmental Core with BundleParc
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