Table 3.
The difference between the planned and delivered DVH metrics of target volumes and OARs of plans generated with CTV-PTV margin ranging between 7 mm and 3 mm.
| Structure | DVH metric | CTV-PTV margin | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7 mm | 6 mm | 5 mm | 4 mm | 3 mm | ||||||||
| C | NC | C | NC | C | NC | C | NC | C | NC | |||
| CTV | D99 | Mean | 0.1 ± 0.2 | -0.1 ± 0.5 | 0.1 ± 0.2 | -0.1 ± 0.6 | 0.0 ± 0.2 | -0.2 ± 0.6 | -0.1 ± 0.2 | -0.6 ± 0.7 | -0.2 ± 0.3 | -1.1 ± 1.1 |
| ANOVA statistics |
f=0.49,p=0.61 | f=0.42,p=0.66 | f=1.12,p=0.33 | f=5.89,p=0.01 | f=6.19,p=0.01 | |||||||
| p=0.85 | p=0.90 | p=0.90 | p=0.88 | p=0.99 | p=0.44 | p=0.94 | p=0.01* | p=0.77 | p=0.01* | |||
| PTV | D98 | Mean | -1.2 ± 0.8 | -2.1 ± 2.0 | -1.4 ± 0.8 | -2.4 ± 2.0 | -1.4 ± 0.7 | -2.3 ± 2.0 | -1.2 ± 0.5 | -2.2 ± 1.3 | -1.4 ± 0.5 | -2.7 ± 1.3 |
| ANOVA statistics |
f=13.37,p=0.00 | f=14.44,p=0.00 | f=15.82,p=0.00 | f=17.49,p=0.00 | f=19.44,p=0.00 | |||||||
| p=0.01* | p=0.00* | p=0.01* | p=0.00* | p=0.00* | p=0.00* | p=0.01* | p=0.00* | p=0.01* | p=0.00* | |||
| Rectum | V46 | Mean | -0.8 ± 0.9 | -0.1 ± 2.1 | -0.7 ± 1.0 | -0.9 ± 1.8 | -0.6 ± 0.9 | -0.8 ± 1.7 | -0.3 ± 0.7 | -0.2 ± 1.4 | -0.3 ± 0.6 | -0.4 ± 1.4 |
| ANOVA statistics |
f=0.39,p=0.68 | f=0.44,p=0.65 | f=0.37,p=0.69 | f=0.02,p=0.97 | f=0.03,p=0.97 | |||||||
| p=0.69 | p=0.99 | p=0.76 | p=0.65 | p=0.75 | p=0.72 | p=0.97 | p=0.98 | p=0.98 | p=0.97 | |||
| V60 | Mean | -1.3 ± 0.9 | -1.6 ± 1.4 | -1.2 ± 0.8 | -1.5 ± 1.2 | -1.0 ± 0.8 | -1.3 ± 1.1 | -0.7 ± 0.6 | -0.8 ± 0.8 | -0.7 ± 0.6 | -0.8 ± 0.7 | |
| ANOVA statistics |
f=7.20,p=0.00 | f=5.69,p=0.01 | f=5.92,p=0.00 | f=3.99,p=0.02 | f=3.59,p=0.04 | |||||||
| p=0.01* | p=0.00* | p=0.04* | p=0.05* | p=0.03* | p=0.01* | p=0.08 | p=0.03* | p=0.12 | p=0.05 | |||
| Bladder | V46 | Mean | -0.3 ± 2.4 | -0.5 ± 4.2 | -0.3 ± 2.2 | -0.6 ± 4.0 | -0.5 ± 2.1 | -0.7 ± 3.9 | -0.9 ± 1.7 | -1.6 ± 3.1 | -0.8 ± 1.2 | -1.4 ± 3.2 |
| ANOVA statistics |
f=0.01,p=0.99 | f=0.01,p=0.99 | f=0.02,p=0.98 | f=0.11,p=0.89 | f=0.05,p=0.95 | |||||||
| p=0.99 | p=0.99 | p=0.99 | p=0.99 | p=0.99 | p=0.97 | p=0.96 | p=0.89 | p=0.98 | p=0.95 | |||
| V60 | Mean | -1.7 ± 1.5 | -2.5 ± 3.1 | -1.5 ± 1.5 | -2.1 ± 3.0 | -1.4 ± 1.2 | -2.0 ± 2.5 | -1.5 ± 1.1 | -2.4 ± 2.5 | -1.5 ± 1.0 | -2.5 ± 2.4 | |
| ANOVA statistics |
f=1.09,p=0.34 | f=0.92,p=0.40 | f=1.35,p=0.26 | f=1.39,p=0.26 | f=0.99,p=0.38 | |||||||
| p=0.59 | p=0.32 | p=0.65 | p=0.38 | p=0.49 | p=0.25 | p=0.56 | p=0.23 | p=0.68 | p=0.36 | |||
C- Corrected treatment scenario, NC- not corrected treatment scenario.
The statistically significant differences are denoted by *.