Reliability of [18F]-FTC-146 Brain Uptake in Healthy Controls

Two 5 mCi \[18F\]-FTC-146 doses will be administered intravenously on two separate scan days at least one week apart (total per study = 10 mCi) Participants who complete both test days will receive 10 mCi total dose; however, if a participant is unable to return for a second test day due to unforeseen circumstances, they will receive 5 mCi total dose.