Optimal Counting Levels at Scan Time and Derived 18F-FDG Injected Activity
| Body mass | ||||
| Parameter | Equation | 50 kg | 75 kg | 100 kg |
| PSF7 | A⋅t = 260⋅m | 106 MBq | 158 MBq | 211 MBq |
| PSF2 (24) | A⋅t = 41⋅m1.48 | 111 MBq | 189 MBq | 300 MBq |
| OSEM3D (24) | A⋅t = 12⋅m1.82 | 126 MBq | 244 MBq | 426 MBq |
A = activity at scan time (MBq); t = acquisition duration (s); m = body mass.
Coefficients α and β (Eq. 7) for OSEM3D and PSF2 were determined through regression of data from Table V in reference 24. Injected activity is decay-corrected for 60 min before scan time and typical 3-min acquisition duration per bed position.