Monkey microPET images (+)-[11C]dihydrotetrabenazine (DTBZ),
(±)-[18F]fluoroethyldihydrotetrabenazine (FE-DTBZ),
(±)-[18F]fluoropropyldihydrotetrabenazine (FP-DTBZ), and
(+)-[18F]fluoropropylDTBZ. Images are transaxial slices at the level of the striatum, representing summations of the last 20 minutes of emission data (40–60 min for (+)-DTBZ, (±)-FE-DTBZ, and (±)-FP-DTBZ).