Fig. 2.

Simulated lesion phantom with 25, 5 mm diameter spheres at multiple radial positions (r = 0, 2, 4 and 6 cm) with 4:1 and 8:1 activity uptake ratios with respect to the background. The cylinder diameter and axial length were 14 cm. Note that the partial curved detectors as shown here provide a schematic view of their location relative to the lesion phantom and all subsequent studies have the same detector placement.