Table 2.
The data for PTV coverage for IMRT, VMAT, and Hybrid IMRT/VMAT plans.
| IMRT | VMAT | Hybrid | IMRT versus VMAT | IMRT versus Hybrid | VMAT versus Hybrid | |
|---|---|---|---|---|---|---|
| Mean ± SD | Mean ± SD | Mean ± SD | p value | p value | p value | |
| PTV | ||||||
| D 98% (Gy) | 64.6 ± 0.5 | 64.6 ± 0.5 | 65.0 ± 0.3 | >0.05 | <0.05 | <0.05 |
| D 2% (Gy) | 72.6 ± 1.7 | 73.3 ± 1.7 | 71.5 ± 1.0 | >0.05 | <0.05 | <0.05 |
| CN | 0.79 ± 0.05 | 0.86 ± 0.04 | 0.88 ± 0.03 | <0.05 | <0.05 | <0.05 |
| HI (%) | 11.3 ± 0.7 | 12.6 ± 0.6 | 9.8 ± 0.3 | <0.05 | <0.05 | <0.05 |
PTV is planning target volume, IMRT is intensity modulated radiation therapy, VMAT is volumetric modulated arc therapy, CN is conformation number, and HI is homogeneity index.