Table 1 Summary of clinical characteristics of patients and image acquisition parameters in different centers
Variable | Center 1 | Center 2 |
|---|---|---|
Patient characteristic | ||
Patient NO | 26 | 19 |
Age(year) (Range) | 36 (8–77) | 38 (18–66) |
Female | 14 | 11 |
Male | 12 | 8 |
Histological type | ||
Hodgkin | 11 | 15 |
Non-Hodgkin | 15 | 4 |
Lesion NO | 81 | 45 |
Lesion treatment response | ||
Responding | 55 | 20 |
Non-responding | 26 | 25 |
CT parameters | ||
kVp (min, max, avg) | (80, 120, 119) | (80, 140, 120) |
Tube current (min, max, avg) | (50, 250, 110) | (50, 150, 100) |
Matrix size | (512 × 512) | (512 × 512) |
Slice thickness (mm) | 3 | 5 |
Pixel spacing (mm) | 0.97 | 0.97 |
PET parameters | ||
Scanner | Biograph mCT | Biograph 6 |
PET acquisition time [min, max, avg (min)] | (47, 83, 61) | (47, 81, 64) |
Delayed PET acquisition time [min, max, avg (min)] | (75, 228, 133) | (97, 220, 145) |
Matrix size | 200 × 200 | 168 × 168 |
Slice thickness (mm) | 5 | 5 |
Pixel spacing (mm) | 4.0728 | 4.0728 |
Reconstruction method | OSEM | OSEM |
Iteration and subset | 2i, 24 s | 2i, 21 s |
Filter Gauss FWHM (mm) | 4 | 5 |
Frame duration (min) | 3 | 3 |