Table 1.
Descrtiptive statistics of plan complexity, plan quality and deliverability parameters for nasophageal cancer and prostate cancer patients
| NPC | Prostate | P | |
|---|---|---|---|
| Plan complexity | |||
| MU/CP | 3.9 ± 0.3 | 5.6 ± 1.1 | <0.001 |
| %MU/CP < 3 | 0.5 ± 0.05 | 0.3 ± 0.1 | <0.001 |
| SA(cm2)/CP | 70.1 ± 8.3 | 46.0 ± 21.8 | <0.001 |
| %SA < 5 × 5 cm2 | 66.3 ± 9.4 | 38.2 ± 20.0 | <0.001 |
| MCSv/Beam(Arc) | 0.6 ± 0.09 | 0.50 ± 0.09 | <0.001 |
| LT (mm/Arc) | 571.0 ± 27.1 | 0.5 ± 0.09 | <0.001 |
| PTV volume | 854.6 ± 168.2 | 325.5 ± 210.1 | <0.001 |
| MU | 702.6 ± 55.7 | 504.6 ± 99.2 | <0.001 |
| Plan quality | |||
| GTVV95% | 95.4 ± 12.4 | 99. 6 ± 0.6 | 0.06 |
| PTVV95% | 93.7 ± 3.5 | 95.5 ± 3.53 | 0.03 |
| GTVHI | 0.1 ± 0.03 | 0.07 ± 0.03 | <0.001 |
| PTVHI | 0.3 ± 0.08 | 0.1 ± 0.04 | <0.001 |
| CI | 0.9 ± 0.06 | 0.9 ± 0.06 | 0.64 |
| CN | 0.8 ± 0.05 | 0.8 ± 0.05 | 0.41 |
| Deliverability | |||
| 2D gamma passing rate (%) | |||
| 4%/4 mm | 99.2 ± 1.6 | 99.6 ± 0.4 | 0.04 |
| 3%/3 mm | 97.1 ± 1.3 | 97.9 ± 1.1 | 0.001 |
| 2%/2 mm | 87.6 ± 3.4 | 89.1 ± 3.6 | 0.05 |
| 3D gamma passing rate (%) | |||
| 4%/4 mm | 98.7 ± 0.9 | 99.6 ± 0.3 | <0.001 |
| 3%/3 mm | 96.0 ± 2.2 | 98.4 ± 0.9 | <0.001 |
| 2%/2 mm | 90.0 ± 4.3 | 93.7 ± 1.8 | <0.001 |
%MU/CP < 3 = the proportion of MU/CP less than 3, %SA < 5×5 cm2 = the proportion of SA less than 5 × 5 cm2, GTVV95% = the percent volume of the GTV covered by the 95% prescription isodose line, PTVV95% = the percent volume of the PTV covered by the 95% prescription isodose line, GTVHI = the HI of the GTV, PTVHI = the HI of the PTV.