Advanced Imaging Tools in the Study of Mild Traumatic Brain Injury

Inclusion Criteria: Study group: * Between 18 and 55 years of age inclusive. * Potential participant verbally verifies diagnosis of mTBI at pre-screen. * Diagnosed with mild traumatic brain injury by a VAMC physician according to standard diagnostic criteria \[12\],\[13\], to be verified by chart review. * Less than 24 months from trauma resulting in mTBI. * Able to read and write in English. * Willingness to refrain from nicotine, and beverages containing either alcohol or caffeine for at least four hours prior to the imaging session. * Have signed the consent form for the study. Control Group: * Between 18 and 55 years of age inclusive. * Potential participant verbally denies history of mTBI at pre-screen. * Able to read and write in English. * Willingness to refrain from nicotine, and beverages containing either alcohol or caffeine for at least four hours prior to the imaging session. * Have signed the consent form for the study Exclusion Criteria: * Conditions that would preclude the completion of a MRI, PET, or CT exam such as claustrophobia, pacemaker, metal objects in body, and/or pregnancy. * Serious, unstable medical or mental illness. * Medical contraindication to any element of the study procedure. * Have not read and signed an informed consent form, or do not understand its contents.