Anterior maximum-intensity projections of 18F-GP1 PET/CT over 120 min show positive 18F-GP1 accumulation in pulmonary arteries (arrows) and in proximal (dotted arrows) and distal (arrowheads) veins of leg, which are gradually distinct on late images as 18F-GP1 activity from other organs is excreted via both urinary and hepatobiliary tracts. Courtesy of Dae Hyuk Moon, MD, et al.