1Department
of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States; 2Department
of Biostatistics, University of Michigan, Ann Arbor, MI, United States; 3Department
of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United
States
We examined regional variation in DTI changes following chemoradiotherapy. The largest fractional anisotropy decreases were seen in the cingula, fornix, and corpus callosum. This pattern of selective white matter degradation may be related to specific neurocognitive impairments commonly seen following treatment. Radial and axial diffusivity changes were temporally and spatially separated, supporting their use as specific markers of distinct pathological processes.