Table 1.
A summary of major simulation parameters.
| Parameter | Value | Parameter | Value | |
|---|---|---|---|---|
| EGRT | PET detector extent | 2 cm | Leaf aperture at iso(x-y) | 0.5 cm |
| PET detector coverage | 180° arc | Leaf aperture at iso (z) | 1 cm | |
| PET ring radius | 50 cm | EGRT spatial window | ±0.5° arc | |
| Linac rotating frequency | 1 Hz | EGRT time window | 500 ms | |
| Linac radius | 60 cm | Helical pitch (conventional) | 0.2 | |
| Background activity | 3 kBq/cc | |||
| Collimator radius | 50 cm | Radiotracer | FDG | |
| Collimator leaves | 64 | Firing positions | 256 | |
| GATE | Version | V5.0.0.p01 | Light decay time (LSO) | 40 ns |
| Coincidence window | 10 ns | Energy resolution | 0.26 | |
| Scatter threshold (keV) | 350, 650 | Multiple coincidence policy | takeWinnerofGoods | |
| XCAT-lung | Respiration period | 4.2 s | Phantom size | 256 × 256 × 35 |
| Respiration phases | 12 | Voxel resolution | 2 mm | |
| GTV size | 9.40 cm3 | Sinogram bin size | 256 × 64 × 35 | |
| ITV size | 17.01 cm3 | Tracer uptake ratio | 8:0.5:1 | |
| PTV size | 153.90 cm3 | |||
| XCAT-prostate | PTV margin | 6 mm | Phantom size | 256 × 256 × 39 |
| Setup error | 6 mm | Voxel resolution | 2 mm | |
| GTV/ITV size | 33. 27 cm3 | Sinogram bin size | 256 × 64 × 39 | |
| PTV size | 71.73 cm3 | Tracer uptake ratio | 8.5:1 |