Fig. 1.

NEMA IEC image quality body phantom (i) background variability (SD of the activity concentration in large ROIs of about 4 cm²) and (ii) contrast-to-noise ratio using Hadassah (H) and manufacturer recommendation (GE) OSEM+TOF+PSF reconstruction algorithms and, Q.Clear with different values of β and (a) 1.5 min/bp, (b) 1.0 min/bp and (c) 0.5 min/bp. The phantom background region and spheres contained a ⁶⁸Ga activity concentration of 2.48 kBq/mL and 9.92 kBq/mL (4:1 sphere-to-background ratio), respectively, at the time of acquisition