Table 2.
Scanning parameters
| Scanning characteristics/parameters | Training cohort (= 36) | Validation cohort (= 36) |
|---|---|---|
| CT scanners |
Siemens Biograph40 (n = 9) GE Discovery STE (n = 7) GE Discovery 690 (n = 15) GE Discovery VCT (n = 5) |
Siemens Biograph40 (n = 16) Siemens Biograph128 (n = 4) GE Discovery STE (n = 3) GE Discovery 690 (n = 3) GE Discovery VCT (n = 7) GE Discovery 600 (n = 1) GE Discovery MI (n = 2) |
| - Slice thickness (mm) | 2.5–4 | 1.25–3.27 |
| - In-plane resolution (mm) | 0.98–1.52 | 0.98–1.52 |
| - kV | 100; 120; 140 | 100; 120; 140 |
| - mAs | 62–402 | 23–136 |
| - Reconstruction kernel |
Soft kernel (n = 33) Sharp kernel (n = 3) |
Soft kernel (n = 20) Sharp kernel (n = 16) |
| PET scanners |
Siemens Biograph40 (n = 9) GE Discovery STE (n = 7) GE Discovery 690 (n = 15) GE Discovery VCT (n = 5) |
Siemens Biograph40 (n = 15) Siemens Biograph128 (n = 4) GE Discovery STE (n = 3) GE Discovery 690 (n = 4) GE Discovery VCT (n = 7) GE Discovery 600 (n = 1) GE Discovery MI (n = 2) |
| - Slice thickness (mm) | 2.5–4 | 2–3.27 |
| - In-plane resolution (mm) | 2.73–5.47 | 2.73–5.47 |
| - Administered FDG activity (MBq), median (range) | 337.5 (188–417) | 316.3 (204.1–408) |
| - Delay between administration of FDG and scanning (min) | 46.1–85.6 | 49.8–91.1 |
| - Reconstruction algorithm |
3D OSEM (n = 18) 3D OSEM with PSF (n = 18) |
3D OSEM (n = 24) 3D OSEM with PSF (n = 12) |
kV kilovolt, mAs milliampere-second, MBq Mega Becquerel, OSEM ordered subset expectation maximization., PSF point spread function modeling