Fig. 4

A Dual phantoms position within PET FOV. Volumes of interest are located at 20 and 30 mm, respectively, from the center of the FOV. B Slices from reconstructed images of phantom #1 scanned in SOLO TEST (Lower Position), SOLO TEST (Upper Position) or DUO TEST. Color-coded profile lines were drawn through the phantoms in all scans (left) to obtain representative plots of radioactivity distribution (right)