Control #1 is a 58-year-old male and Control #2 is a 64-year-old male. Neither control had a significant history of TBI or neurodegenerative symptoms. Control #1 scored within normal limits on all testing for the neuropsychological battery administered to patients. Control #2 scored 30/30 on the MMSE. Volumetric analysis demonstrated no abnormalities in any brain region. Normalized MRI, NeuroReader segmentation, and [18F]AV-1451 SUVR images for Control #1 are presented in Figures 3A-C, respectively. Normalized MRI, NeuroReader segmentation, and [11C]PiB SUVR images for Control #2 are presented in Figures 3D-F, respectively.