TABLE II.
Values of dosimetric parameters in the 3-beam IMPT-3D plan and 36-beam IMPT-DET plan with robust optimization for the prostate cancer case.
| Tissue | Dosimetric parameter | 3-beam IMPT | 36-beam IMPT-DET |
|---|---|---|---|
| CTV | D99% (Gy) | 76.0 | 75.7 |
| D1% (Gy) | 77.2 | 79.9 | |
| Rectum | V10 (%) | 63.6 | 49.1 |
| V20 (%) | 42.7 | 36.9 | |
| V40 (%) | 11.8 | 21.7 | |
| V60 (%) | 5.0 | 13.5 | |
| V70 (%) | 2.5 | 9.2 | |
| Dmean (Gy) | 19.6 | 21.1 | |
| Bladder | V10 (%) | 26.7 | 29.6 |
| V20 (%) | 17.0 | 20.6 | |
| V40 (%) | 9.0 | 11.4 | |
| V60 (%) | 5.1 | 6.2 | |
| V70 (%) | 3.0 | 3.3 | |
| Dmean (Gy) | 10.1 | 10.7 | |
| Femoral heads | Dmax (Gy) | 12.1 | 29.3 |
| Dmean (Gy) | 2.37 | 3.9 |