Table 2.
Dosimetric comparisons of PTVs between RapidArc and HT plans.
| RapidArc | HT | P-value | ||
|---|---|---|---|---|
| Average (SD) | Average (SD) | |||
| D98(cGy) | PGTVnx | 6930 (91) | 6938 (88) | NS |
| PGTVnd | 6978 (83) | 6964 (102) | NS | |
| PTV1 | 6066 (154) | 6098 (146) | NS | |
| PTV2 | 5331 (258) | 5391 (144) | NS | |
| HI | PGTVnx | 0.073 (0.013) | 0.073 (0.013) | NS |
| PGTVnd | 0.076 (0.011) | 0.07 (0.011) | NS | |
| PTV1 | 0.201 (0.034) | 0.205 (0.026) | NS | |
| PTV2 | 0.31 (0.071) | 0.297 (0.073) | NS | |
| CI | PGTVnx+nd | 0.818 (0.025) | 0.861 (0.033) | 0.004 |
| PTV1 | 0.453 (0.246) | 0.515 (0.268) | NS | |
| PTV2 | 0.627 (0.269) | 0.591 (0.245) | NS |
SD: standard deviation; D98: the maximum dose encompassing 98% of PTV; HI: homogeneity index; CI: conformity index. The CI of PGTVnx and PGTVnd were calculated integrally because they were given the same prescription dose.