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 |