PET SUV images after injection of 18F-FP-(+)-DTBZ (A, C, and D) and 18F-FP-(−)-DTBZ (B). All images are displayed on the same SUV scale. A, C, D: PET images, summed from 120 to 150 min, from the same baboon (Baboon B) scanned with 18F-FP-(+)-DTBZ under control condition (A) and following displacement by unlabeled FP-(+)-DTBZ (C) and fluvoxamine (D). B: PET images of 18F-FP-(−)-DTBZ summed from 0 to 90 min (Baboon D).