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Table 1 Calculated activity concentrations in background (CB,0) and in hot spheres (CH,0), total activity (A0) at scan start, and time between scanning (Δt) at the PET/MRI and the PET/CT

From: Image quality and detectability in Siemens Biograph PET/MRI and PET/CT systems—a phantom study

  Sphere to background
8:1 4:1
PET/MRI PET/CT PET/MRI PET/CT
CB,0 [kBq/mL] 3.5 3.1 3.9 3.4
CH,0 [kBq/mL] 28.6 25.1 15.4 13.7
A0 [MBq] 20.3 17.8 21.9 19.4
Δt [min] 20 19