Table 1. Comparison of dosimetric parameters between the 3 types of plans in all 20 cases.
| ROI | Parameters | E1P plan | P3P plan | P5P plan |
|---|---|---|---|---|
| PTV1 | Mean dose (Gy) | 60.0 ± 0.6 | 69.1 ± 0.6 | 60.1 ± 0.6 |
| V40 (%) | 100.0 ± 0.1 | 100.0 ± 0.1 | 100.0 ± 0.1 | |
| V45 (%) | 99.7 ± 0.3 | 99.5 ± 0.5 | 99.6 ± 0.5 | |
| V50 (%) | 98.5 ± 1.5 | 98.2 ± 1.9 | 98.3 ± 1.8 | |
| V55 (%) | 95.0 ± 3.2 | 94.5 ± 3.4 | 94.7 ± 3.3 | |
| V60 (%) | 69.8 ± 8.8 | 71.5 ± 8.3 | 71.5 ± 9.3 | |
| PTV2 | Mean dose (Gy) | 52.1 ± 0.6 | 53.2 ± 0.8 | 53.1 ± 0.6 |
| V40 (%) | 98.3 ± 0.7 | 98.8 ± 0.5 | 98.8 ± 0.6 | |
| V45 (%) | 94.1 ± 1.5 | 95.3 ± 1.3 | 95.3 ± 1.2 | |
| V50 (%) | 81.8 ± 3.8 | 84.7 ± 3.9 | 84.9 ± 3.3 | |
| V55 (%) | 17.5 ± 5.1 | 31.8 ± 10.2 | 30.1 ± 8.1 | |
| V60 (%) | 1.8 ± 0.9 | 5.4 ± 2.0 | 5.2 ± 1.6 | |
| Heart | Mean dose (Gy) | 3.5 ± 2.7 | 3.6 ± 2.7 | 3.5 ± 2.7 |
| V10 (%) | 5.6 ± 6.6 | 4.8 ± 5.9 | 4.9 ± 6.1 | |
| V20 (%) | 3.4 ± 4.4 | 3.3 ± 4.3 | 3.3 ± 4.3 | |
| V30 (%) | 2.6 ± 3.5 | 2.5 ± 3.5 | 2.6 ± 3.5 | |
| V40 (%) | 2.0 ± 2.8 | 1.9 ± 2.7 | 1.9 ± 2.7 | |
| V50 (%) | 1.0 ± 1.6 | 0.8 ± 1.5 | 0.9 ± 1.5 | |
| Total lung | Mean dose (Gy) | 5.9 ± 1.7 | 5.7 ± 1.6 | 5.7 ± 1.6 |
| V5 (%) | 17.6 ± 6.0 | 15.3 ± 4.9 | 15.5 ± 5.0 | |
| V10 (%) | 12.0 ± 3.8 | 11.3 ± 3.5 | 11.4 ± 3.5 | |
| V15 (%) | 10.3 ± 3.2 | 10.0 ± 3.1 | 10.1 ± 3.1 | |
| V20 (%) | 9.4 ± 3.0 | 9.2 ± 2.9 | 9.3 ± 2.8 | |
| V25 (%) | 8.8 ± 2.9 | 8.6 ± 2.8 | 8.6 ± 2.8 | |
| V30 (%) | 8.2 ± 2.8 | 8.1 ± 2.7 | 8.1 ± 2.7 |
Abbreviation: ROI = region of interest; E1P plan = electron 1 portal plan; P3P plan = photon 3 portal plan; P5P plan = photon 5 portal plan; Vn = percentage of volume receiving more than at least n Gy