Table 4.
Planning target volume (PTV) averaged parameters (mean ± SD), evaluation indices, integral dose, treatment time and comparison p-values
| Parameter | VMAT | HT | p-value |
|---|---|---|---|
| Length [cm] | 54.29 ± 9.79 | – | |
| Volume [cm3] | 1714.26 ± 801.44 | – | |
| Dmean [cGy] | 843.23 ± 9.58 | 831.86 ± 9.51 | 0.004 |
| D2% [cGy] | 889.30 ± 18.00 | 854.10 ± 16.21 | 0.000 |
| D95% [cGy] | 800.50 ± 14.26 | 801.29 ± 1.85 | 0.297 |
| D98% [cGy] | 786.23 ± 11.45 | 785.05 ± 6.97 | 0.668 |
| V100 (%) | 95.57 ± 2.17 | 95.05 ± 0.47 | 0.170 |
| V107 (%) | 23.83 ± 12.13 | 6.48 ± 5.63 | 0.000 |
| CI | 1.34 ± 0.10 | 1.22 ± 0.08 | 0.001 |
| HI | 0.13 ± 0.04 | 0.09 ± 0.05 | 0.001 |
| CN | 0.71 ± 0.05 | 0.78 ± 0.05 | 0.001 |
| GI | 4.35 ± 0.73 | 4.62 ± 1.11 | 0.181 |
| ID [cGy] | 334.83 ± 55.09 | 356.56 ± 53.38 | 0.148 |
| ID(NTT) [cGy] | 282.10 ± 40.42 | 318 ± 38.49 | 0.043 |
CI — conformity index; HI — homogeneity index; CN — conformation number; GI — gradient index; ID — integral doses; ID(NTT) — integral doses to non-tumor tissue