Along-Tract Statistical Mapping of Microstructural Abnormalities in Bipolar Disorder: A Pilot Study
Summary
This study mapped brain microstructural differences in bipolar disorder (BD) using advanced tractography. Bipolar disorder showed distinct white matter (WM) abnormalities in specific brain pathways compared to healthy controls.
Area of Science:
- Neuroimaging
- Neuroscience
- Psychiatry
Background:
- Bipolar disorder (BD) research requires understanding brain circuitry for biomarkers.
- Previous studies lacked fine-scale spatial mapping of brain microstructural differences in BD.
Purpose of the Study:
- To map and visualize microstructural abnormalities along white matter (WM) fiber tracts in individuals with BD.
- To identify along-tract WM microstructural differences between BD patients and healthy controls.
Main Methods:
- Utilized BUndle ANalytics (BUAN), a novel tractography approach, on diffusion MRI data.
- Extracted, mapped, and visualized microstructural profiles on a 3D fiber tract model.
- Compared individuals with BD (N=38) against healthy controls (N=49).
Main Results:
- Individuals with BD exhibited lower mean fractional anisotropy (FA) in fronto-limbic and interhemispheric pathways.
- Higher mean FA was observed in posterior WM bundles in the BD group compared to controls.
- BUAN identified distinct along-tract effects on WM microstructure.
Conclusions:
- BUAN effectively captures along-tract microstructural effects, aiding disease classification.
- Findings reveal specific WM pathway alterations in bipolar disorder.
- This approach may help develop biomarkers for genetic and interventional studies in BD.
