[18F]FDOPA uptake in the raphe nuclei complex reflects serotonin transporter availability. A combined [18F]FDOPA and [11C]DASB PET study in Parkinson's disease

► In serotoninergic areas [18F]FDOPA uptake reflects serotonin transporter availability. ► [18F]FDOPA PET is a valid marker of serotoninergic function in Parkinson disease. ► Support previous studies of serotonin function in Parkinsonism with [18F]FDOPA PET.