Table 1 Dosimetric comparison between VMAT and IMRT plans: planned target volume and organs at risk
VMAT | IMRT | p-value | ||
|---|---|---|---|---|
PTV | ||||
D2% (Gy) | 51.9 ± 0.5 | 52.2 ± 0.3 | 0.02 | |
D98% (Gy) | 47.4 ± 1.6 | 48.0 ± 0.3 | 0.36 | |
V95% (%) | 98.7 ± 0.8 | 98.7 ± 0.4 | 0.59 | |
V105% (%) | 0.5 ± 0.4 | 1.3 ± 1.1 | 0.22 | |
D5% - D95% (Gy) | 3.3 ± 1.1 | 3.0 ± 0.3 | 0.07 | |
CI90 | 1.5 ± 0.3 | 1.7 ± 0.2 | 0.06 | |
Rectum | ||||
Mean (Gy) | 37.1 ± 1.5 | 38.1 ± 1.7 | 0.21 | |
D2% (Gy) | 49.5 ± 0.6 | 49.4 ± 0.9 | 0.60 | |
V40Gy (%) | 39.2 ± 5.1 | 40.7 ± 5.1 | 0.51 | |
Bladder | ||||
Mean (Gy) | 38.1 ± 1.4 | 38.8 ± 1.9 | 0.22 | |
D2% (Gy) | 50.4 ± 0.9 | 50.3 ± 0.5 | 0.77 | |
V40Gy (%) | 47.3 ± 4.0 | 46.6 ± 5.6 | 0.63 | |
Small bowel | ||||
Mean (Gy) | 28.8 ± 2.5 | 30.1 ± 1.4 | 0.03 | |
D2% (Gy) | 49.5 ± 0.8 | 49.9 ± 0.5 | 0.29 | |
V40Gy (%) | 20.3 ± 3.3 | 21.3 ± 3.5 | 0.41 | |
Left femoral head | ||||
D2% (Gy) | 39.8 ± 1.7 | 40.3 ± 4.1 | 0.13 | |
V40Gy (%) | 2.3 ± 1.4 | 2.9 ± 1.9 | 0.46 | |
Right femoral head | ||||
D2% (Gy) | 39.1 ± 3.5 | 39.2 ± 5.0 | 0.18 | |
V40Gy (%) | 2.5 ± 1.7 | 2.6 ± 1.9 | 0.60 |