Neuraceq™ PET for Detection of Brain Changes in Young Athletes Post-concussion

Inclusion Criteria: * 18-40 years of age * A minimum of 1 concussion prior to study entry * A minimum of one year post first concussion * mTBI as defined by the American Congress of Rehabilitative Medicine * Participants in Cohort A must have either subjective or objective evidence of persistent cognitive deficits Exclusion Criteria: * Impaired decision-making capacity, i.e. inability to provide informed consent * Pregnancy * History of other neurologic disorders (e.g., epilepsy, cerebrovascular disease, neurodegenerative disorders, intellectual disability) * Significant systemic medical illness * Current DSM-IV Axis I diagnosis of psychiatric illness