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Table 3 The number of prompts, randoms, total net trues, and estimated scatter fraction, for the phantom scans (PET/CT 150 s acquisition, PET/MRI 97 s acquisition), for activity concentrations of 8:1 and 4:1

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/CT PET/MRI PET/CT PET/MRI
Prompts (MCts) 20.9 22.2 22.6 24.2
Randoms (MCts) 1.8 3.1 2.0 3.5
Total net trues (MCts) 19.1 19.2 20.7 20.7
Scatter fraction (%) 30.1 31.1 29.8 30.9