RecruitingLongitudinal Assessment of Traumatic Microvascular Injury-2The goal of this observational study is to learn about changes in the brain of patients over the first 3 years following a traumatic brain injury (TBI). The main question it aims to answer are: \- How TBI effect the rate of brain tissue loss compare to healthy brain Participants will give blood samples, complete MRI scans, and neuropsychological assessment measures. Researchers will compare results between healthy control group and TBI group to determine changes in injured brains.