Table 1.
A summary of major simulation parameters.
| Parameter | Value | Parameter | Value | |
|---|---|---|---|---|
| EGRT/hIMRT | PET detector extent | 2 cm | Leaf aperture at iso (x-y) | 0.5 cm |
| PET detector coverage | 2 × 90° arc | Leaf aperture at iso (z) | 0.5 cm | |
| PET ring radius | 50 cm | Source intersection tolerance | ±0.5° arc | |
| Linac rotating frequency | 1 Hz | Response time window | 500 ms | |
| Linac radius | 60 cm | hIMRT pitch | 0.4 | |
| Collimator radius | 50 cm | Radiotracer | FDG | |
| Collimator leaves | 64 | Firing positions | 256 | |
| 3D IMRT | SAD | 100 cm | Field number | 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 phantom | Respiration period | 4.2 s | Phantom size | 256 × 256 × 35 |
| Respiration phases | 12 | Voxel resolution | 2 × 2 × 2 mm3 | |
| Couch travel range | 7 cm | Dose grid resolution | 4 × 4 × 4 mm3 | |
| GTV size | 9.40 cm3 | Sinogram bin size | 256 × 64 × 35 | |
| ITV size | 17.01 cm3 | Tracer uptake ratio | 8:0.5:1 | |
| ITV to PTV margin | 6 mm | Background activity | 3 kBq/cc | |
| Treatment time | 1200 s | IMRT field resolution | 5 × 2 mm2 | |
| Prescription dose | 70 Gy | |||
| Clinical patient | Respiration phases | 6 | 4D-CT size | 512 × 512 × 40 |
| Average GTV size | 3.33 cm3 | 4D-CT resolution | 0.98 × 0.98 × 2.5 mm3 | |
| Couch travel range | 9 cm | Breath-hold resolution | 0.98 × 0.98 × 1.25 mm3 | |
| ITV size | 5.97 cm3 | Dose grid resolution | 3.92 × 3.92 × 2.5 mm3 | |
| Treatment time | 1200 s | Sinogram bin size | 256 × 64 × 40 | |
| IMRT field resolution | 5 × 2.5 mm2 | Tracer uptake SUV | ∼6 (GTV), ∼1(Bg.) | |
| PTV size | 16.8 cm3 | Prescription dose | 54 Gy |