Fig. 6

Equatorial slices of standard spheres of NEMA-IQ and b-NEMA-IQ phantoms for low (5.0) and intermediate (8.8) TBR, two values of AC (1.3 and 2.2 kBq/ml) and two values of ESD (60 and 120 s). The impact of increasing ESD or AC is evident on both the reduction of noise in the background and in the greater visibility of the 10-mm sphere