Table 1.
Mean values of dosimetric parameters and doses at organs at risk (OARs) of both plans
| Dosimetric parameter | PDS plan | OPT plan | p value |
|---|---|---|---|
| VPTV90 [%] | 88.6 ± 7.0 | 98.1 ± 2.4 | < 0.05 |
| VPTV100 [%] | 79.9 ± 7.2 | 93.9 ± 3.6 | < 0.05 |
| D90 [%] | 88.2 ± 9.3 | 105.9 ± 9.5 | < 0.05 |
| D100 [%] | 59.8 ± 9.4 | 75.7 ± 5.4 | < 0.05 |
| Skin D0.1cc [%] | 67.5 ± 11.6 | 73.9 ± 10.0 | < 0.05 |
| Skin D2cc [%] | 52.8 ± 7.4 | 59.2 ± 7.7 | < 0.05 |
| Rib D0.1cc [%] | 24.5 ± 17.6 | 28.1 ± 17.0 | < 0.05 |
| Lung D2cc [%] | 18.1 ± 11.2 | 21.0 ± 11.6 | < 0.05 |
| DNR | 0.29 ± 0.05 | 0.42 ± 0.07 | < 0.05 |
| DHI inside PTV | 0.71 ± 0.05 | 0.54 ± 0.09 | < 0.05 |
| COIN | 0.69 ± 0.10 | 0.76 ± 0.06 | < 0.05 |
| TRAK [Gym–1] | 0.0038 ± 0.0014 | 0.0044 ± 0.0017 | < 0.05 |
VPTV90 [%], VPTV100 [%] – relative percentage of planning target volume, which receives 90% and 100% of prescribed dose, respectively; D90 [%], D100 [%] – dose to the 90% and 100% volume of interest relative to the prescribed dose, respectively; D0.1cc, D2cc – dose at the most exposed 0.1cc and 2cc of volume of interest, respectively, DNR – dose nonuniformity ratio, DHI inside PTV – dose homogeneity index inside planning target volume, COIN – conformity index, TRAK [Gym–1] – total reference air kerma, PDS – Paris dosimetry system, OPT – image-based plan using graphical optimization