Table 2.
Characteristics of the treatment plans in this study.
| Categories | Number of treatment plans | Number of sessions | Number of fields per session | Optimization methods | CTV (mL) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Median | Min–Max | SFUD | IMPT | IMPT + SFUD | Mean | Range | |||
| Prostate | 48 | 1280 | 4 | 2–4 | 39 | 9 | 0 | 67.2 | 31.4–126.4 |
| Liver | 40 | 610 | 2 | 2–4 | 39 | 1 | 0 | 288.8 | 1.7–2246.2 |
| Pancreas | 6 | 125 | 2 | 2–2 | 6 | 0 | 0 | 220.3 | 38.6–382.3 |
| Lung | 4 | 40 | 3 | 3–3 | 4 | 0 | 0 | 39.5 | 4.9–77.6 |
| Head & neck | 27 | 439 | 3 | 2–3 | 3 | 24 | 0 | 230.9 | 21.2–626.8 |
| Pediatric | 45 | 600 | 2 | 1–5 | 17 | 25 | 3 | 262.8 | 14.1–1423.1 |
| CSI | 11 | 156 | 4 | 3–4 | 0 | 11 | 0 | 1602.0 | 1380.3–1897.6 |
| Others | 20 | 327 | 2 | 1–3 | 0 | 0 | 0 | 291.3 | 1.5–878.5 |
| Total | 201 | 3577 | 108 | 70 | 3 | ||||
| Categories | Field size [cross line (mm)] | Field size [in line (mm)] | Number of layers per session | Number of spots per session | ||||
|---|---|---|---|---|---|---|---|---|
| Mean | Range | Mean | Range | Mean | Range | Mean | Range | |
| Prostate | 66.4 | 44.8–93.7 | 65.8 | 43.8–93.7 | 80 | 44–113 | 4447 | 2789–6810 |
| Liver | 83.7 | 39.9–196.0 | 81.2 | 39.9–217.0 | 67 | 25–153 | 10 602 | 2297–49 950 |
| Pancreas | 115.8 | 75.5–134.0 | 106.3 | 97.1–117.5 | 63 | 43–73 | 10 146 | 4638–12 216 |
| Lung | 61.6 | 33.0–102.0 | 47.0 | 27.7–66.0 | 94 | 67–141 | 7120 | 2803–11 157 |
| Head & neck | 116.5 | 43.0–245.0 | 129.3 | 56.6–240.0 | 109 | 32–210 | 11 418 | 2957–26 562 |
| Pediatric | 97.7 | 36.0–225.0 | 101.6 | 30.2–308.0 | 107 | 27–237 | 9157 | 2106–26 869 |
| CSI | 128.7 | 56.0–189.0 | 283.0 | 182.0–396.0 | 211 | 174–229 | 59 605 | 40 913–72 362 |
| Others | 97.2 | 30.0–157.0 | 114.6 | 30.0–203.0 | 79 | 24–137 | 10 729 | 2095–24 442 |
Abbreviations: CTV, clinical target volume; IMPT, intensity‐modulated proton therapy; SFU; single‐field uniform.