All quantitative PET sessions included placement of a catheter in the radial artery for sampling blood radioactivity. During the sessions, blood samples were taken at 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.25, 2.75, 3.75, 4.75, 7.50, 12.50, 17.50, 25.00, 35.00, 45.00 minutes after injection.