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Table 4 Image quality comparison for SS and CTM acquisition modes. The sphere-to-background ratio is 4:1 and 8:1. For the 4:1 ratio, the SS acquisition followed the CTM acquisition subsequently. For the 8:1 ratio, the CTM acquisition followed the SS subsequently

From: Performance evaluation of the Biograph mCT Flow PET/CT system according to the NEMA NU2-2012 standard

Sphere diameter (mm) Sphere-to-background ration = 4:1 Sphere-to-background ration = 8:1
Contrast recovery (%) Background variability (%) Contrast recovery (%) Background variability (%)
SS CTM SS CTM SS CTM SS CTM
10 26.0 28.3 5.3 6.9 43.7 41.9 4.9 6.3
13 44.8 47.9 4.6 6.8 59.8 63.1 4.1 5.4
17 61.9 58.4 3.9 5.6 66.6 68.1 3.3 4.4
22 69.2 70.8 3.1 4.7 75.5 76.6 2.8 3.6
28 68.8 67.0 2.5 3.8 70.7 71.3 2.5 3.0
37 76.5 76.9 2.2 2.9 77.5 77.7 2.1 2.4
Lung residual (%) (σ) 12.2 (0.9) 12.3 (1.0)    12.3 (0.9) 12.1 (0.6)