Regional alterations of brain microstructure in Parkinson's disease using diffusion tensor imaging

Area of Science:

• Neuroimaging
• Neurology
• Biomarkers

Background:

• Parkinson's disease (PD) involves pathology in white matter and basal ganglia.
• Microstructural integrity alterations are suspected but require sensitive detection methods.

Purpose of the Study:

• To test if diffusion tensor imaging (DTI) can detect microstructural changes in PD-related brain regions.
• To investigate the association between DTI abnormalities and PD severity and subtypes.

Main Methods:

• Diffusion tensor imaging (DTI) at 4 Tesla was performed on 12 PD patients and 20 controls.
• Fractional anisotropy (FA) and mean diffusivity were analyzed using region-of-interest and voxel-based methods.
• Motor deficits and PD subtypes were assessed using the Unified Parkinson's Disease Rating Scale (UPDRS).

Main Results:

• PD subjects showed reduced FA in precentral gyrus, substantia nigra, putamen, posterior striatum, frontal lobe, and supplementary motor areas.
• Reduced FA in the substantia nigra correlated with increased UPDRS motor scores.
• Spatial correlations between putamen FA alterations and PD subtypes were observed.

Conclusions:

• DTI detects microstructural alterations in key brain regions affected by Parkinson's disease.
• These DTI-derived measures, particularly FA, show potential as biomarkers for PD.
• DTI findings correlate with clinical measures of PD severity and may help in subtype analysis.