This state of the art research study is designed to better understand the long-term consequences of brain injuries from blast explosions or other causes, such as a fall or motor vehicle accident. An important question that we want to answer is whether individuals who

have been exposed to blast or other brain injuries have a build up of protein in the brain that could lead to difficulty in thinking and controlling emotions later in life. If you qualify, you will complete a medical screen and then may be eligible for a lumbar puncture and/or two PET/MRI scans. Participants can choose to take part in either the LP or the PET/MRI or both of these procedures. You will be compensated for completion of each part of the study ($100 for the medical screening visit, $250 for the lumbar puncture, $150 for each the PET/MRI scan). OEF/OIF Veterans with a traumatic brain injury (TBI) or PTSD, or no history of TBI or PTSD, may be eligible to participate. For more information call the research assistant for this study, Lauren at (857) 364-5631.