DTI Indicators of White Matter Injury are Correlated with Multimodal EEG-based Biomarker in Slow Recovering, Concussed Collegiate Athletes.

There are no validated, objective diagnostic or prognostic biomarkers for sports-related concussion (SRC), which hinders evidence-based treatment for concussed athletes. While quantitative electrophysiology (EEG) and diffusion tensor imaging (DTI) are promising technologies for providing objective biomarkers for concussion, the degree to which they are related has not been systematically investigated in concussed athletes. This study examined whether diffusion metrics differentiated concussed athletes with prolonged recovery (n = 18) from non-conccused athletes (n = 13) and whether observed diffusion alterations related to EEG. Collegiate athletes (N = 31) completed EEG, neurocognitive, and magnetic resonance imaging. White matter diffusivity differed between the groups in multiple white matter tracts, including the corpus callosum, cingulum bundle, thalamic radiations, and inferior fronto-occipital, inferior longitudinal, and uncinate fasciculi, but not after correction for multiple comparisons. The enhanced Brain Function Index (eBFI), a measure that combines EEG and neurocognitive data, significantly correlated with altered diffusion in the concussed athletes. These preliminary findings suggest that the absolute deviation of diffusion metrics in concussed versus non-concussed athletes may have clinically utility. Results also suggested that the eBFI may be sensitive to early changes from sports-related concussion.