Table 3.
Target volume dosimetric metrics
| Target volume | 3D-CRT | t-IMRT | p value |
|---|---|---|---|
| PTVeval D98% [Gy] | 40.6 (39.8–41.4) | 40.3 (38.7–41.6) | 0.002 |
| PTVeval D2% [Gy] | 44.7 (44.4–45.5) | 43.8 (43.8–47.1) | NS |
| PTVeval D50% [Gy] | 43.3 (42.7–43.7) | 42.9 (42.2–43.9) | < 0.005 |
| PTVeval V95% [%] | 98.1 (95.3–99.6) | 96.8 (79.9–99.9) | 0.001 |
| PTVeval V105% [%] | 1.3 (0.1–10.3) | 4.3 (0.01–85.9) | < 0.005 |
| PTVeval V105% [cm3] | 11.7 (0.08–656.7) | 5.4 (0.06–68.0) | 0.014 |
| PTVeval V107% [%] | 0 (0–1.4) | 0.1 (0–9.6) | < 0.005 |
| PTVeval V107% [cm3] | 0 (0–321.4) | 0 (0–7.2) | NS |
| PTVeval V110% [%] | 0 (0–0) | 0 (0–0) | NS |
| Dmax [Gy] | 45.7 (45.1–46.9) | 46.9 (45.3–51) | < 0.005 |
3D-CRT = three-dimensional conformal radiotherapy; D2% = near maximum dose, D50% = median dose; D98% = near minumum dose, Dmax = maximal absorbed dose, NS = not significant; PTVeval = planning target volume for evaluation; t-IMRT = tangential intensity modulated radiation therapy; Vx% = fractional volume, receiving x % of the prescribed dose