Table 2. Mean PTV and organ at risk values for 3DCRT IMRT A and IMRT B plans.
| Volume | 3DCRT | IMRT A | IMRT B | P value |
|
|---|---|---|---|---|---|
| 3DCRT vs. IMRT A | IMRT A vs. IMRT B | ||||
| PTV D95% (Gy) | 55.9 | 57.4 | 57.5 | 0.22 | 0.47 |
| PTV D99% (Gy) | 54.2 | 55.6 | 55.3 | 0.01 | 0.28 |
| Esophagus V60Gy (%) | 3.5 | 0 | 0 | 0.17 | – |
| Esophagus V50Gy (%) | 32 | 23.2 | 22.9 | <0.001 | 0.26 |
| Esophagus V40Gy (%) | 36.4 | 27.8 | 27.4 | <0.001 | 0.19 |
| Esophagus NTCP (%) | 15.4 | 10 | 9.9 | 0.003 | 0.51 |
| Heart V30Gy (%) | 21.2 | 17.4 | 15.8 | 0.05 | 0.03 |
| Heart V5Gy (%) | 45.7 | 39.6 | 39.1 | 0.02 | 0.19 |
| Heart NTCP (%) | 5.7 | 3.4 | 2.8 | 0.01 | 0.02 |
| Lung V30Gy (%) | 18.7 | 16.4 | 16.0 | 0.03 | 0.09 |
| Lung V20Gy (%) | 22 | 22 | 21.9 | 0.97 | 0.78 |
| Lung V5Gy (%) | 45.5 | 47.6 | 48 | 0.37 | 0.48 |
| Lung NTCP (%) | 10 | 8.7 | 8.5 | 0.01 | 0.39 |
PTV, planning target volume; NTCP, normal tissue complication probability.