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Table 2 Average, standard deviation, and minimum and maximum values of activity concentrations present in the spherical inserts and main phantom background at the PET acquisition time start. The resulting sphere-to-background activity concentration ratio is also reported

From: Phantom-based image quality assessment of clinical 18F-FDG protocols in digital PET/CT and comparison to conventional PMT-based PET/CT

 Ac,sph (kBq/mL)Ac,bg (kBq/mL)Sphere-to-bg ratio
Average (n = 5)25.285.065.00
Standard deviation (SD)1.250.270.27
Min23.424.674.63
Max26.455.295.46