Table 2.
Mean values of dosimetric parameters divided into two groups of consecutive patients
| Dosimetric parameter | PDS plans | OPT plans | ||
|---|---|---|---|---|
| First 20 patients | Next 29 patients | First 20 patients | Next 29 patients | |
| VPTV100 [%] | 79.5 | 80.3 | 93.5 | 94.2 |
| D90 [%] | 88.8 | 87.8 | 105.0 | 106.4 |
| D100 [%] | 62.0 | 58.3 | 76.7 | 76.0 |
| DNR | 0.33 | 0.26 | 0.44 | 0.4 |
| DHI inside PTV | 0.68 | 0.74 | 0.54 | 0.55 |
| COIN | 0.69 | 0.67 | 0.75 | 0.76 |
VPTV100 [%] – relative percentage of planning target volume, which receives 100% of prescribed dose, D90 [%], D100 [%] – dose to the 90% and 100% volume of interest relative to the prescribed dose, respectively, DNR – dose nonuniformity ratio, DHI inside PTV – dose homogeneity index inside planning target volume, COIN – conformity index, PDS – Paris dosimetry system, OPT – image-based plan using graphical optimization