Table 2.
Planning and dosimetric characteristics of ITV and RTT plans
| Target | ITV | RTT | Pairwise difference (ITV − RTT) | ||||
|---|---|---|---|---|---|---|---|
| Median | Range | Median | Range | Median | Range | P | |
| PTV volume (mL) | 60.0 | 21.3–160.6 | 33.1 | 6.6–88.2 | 17.1 | 3.5–72.4 | <0.001 |
| PTV/lung (%) | 1.53 | 0.58–4.40 | 1.00 | 0.16–2.42 | 0.46 | 0.13–1.98 | <0.001 |
| PTV coverage (%) | 95.5 | 95.0–97.0 | 95.6 | 95.0–96.7 | 0 | −1.4 to 1.1 | 0.76 |
| Rx IDL (%) | 62.0 | 60.0–73.0 | 63.0 | 51.0–74.0 | 0.5 | −13.0 to 10.0 | 0.92 |
| Conformity index | 1.08 | 1.01–1.19 | 1.10 | 0.98–1.36 | −0.02 | −0.32 to 0.10 | 0.19 |
| Total MU | 48,930 | 26,024–77,100 | 36,132 | 14,018–50,722 | 15,690 | −8236 to 36,977 | <0.001 |
| Minutes per fraction | 45.5 | 36–73 | 33 | 24–57 | 12.5 | 2–40 | <0.001 |
| Bilateral lung | |||||||
| Mean (Gy) | 8.20 | 3.84–18.7 | 5.49 | 1.72–11.95 | 1.95 | 0.22–7.37 | <0.001 |
| V2.5 Gy (%) | 34.2 | 14.6–57.5 | 27.1 | 10.1–40.7 | 8.9 | 0.2–19.7 | <0.001 |
| V5 Gy (%) | 22.7 | 8.3–41.5 | 18.3 | 5.5–32.9 | 3.4 | −1.0 to 12.6 | <0.001 |
| V10 Gy (%) | 13.6 | 5.3–29.0 | 11.0 | 3.5–21.3 | 2.0 | −2.6 to 7.7 | 0.001 |
| V13 Gy (%) | 10.9 | 4.4–24.4 | 8.9 | 2.7–18.4 | 1.6 | −2.6 to 6.3 | 0.004 |
| V20 Gy (%) | 7.7 | 3.3–16.1 | 6.2 | 1.7–13.0 | 1.0 | −1.5 to 4.8 | 0.003 |
| V30 Gy (%) | 5.4 | 2.4–11.8 | 4.4 | 1.1–9.7 | 0.9 | −1.0 to 3.4 | 0.002 |
| V40 Gy (%) | 4.2 | 1.9–9.5 | 3.4 | 0.8–7.8 | 0.8 | −0.7 to 3.0 | 0.001 |
| V50 Gy (%) | 3.8 | 1.6–8.0 | 2.8 | 0.6–6.5 | 0.8 | −0.6 to 2.6 | 0.001 |
| NTCP (%) | 8.9 | 3.5–41.1 | 5.1 | 2.1–17.2 | 1.9 | 0.4–25.5 | <0.001 |