Table 3.
Organs at Risk Dosimetric Comparison between Both Radiotherapy Techniques
| Organ | Parameter | 3D-CRT plan | RapidArc plan | P-value |
|---|---|---|---|---|
| Healthy | Dmean (Gy) | 25.2 ± 4.1 | 25.8 ± 4.6 | 0.071 |
| brain volume | D1% (Gy) | 61.2 ± 2.5 | 57.4 ± 3.1 | 0.001 |
| Brainstem | Dmax (Gy) | 52.6 ± 9.5 | 50.5 ± 18.1 | 0.648 |
| Chiasma | Dmax (Gy) | 44.5 ± 13.4 | 41.8 ± 13.8 | 0.127 |
| Ipsilateral optic nerve | Dmax (Gy) | 34.5 ± 17.1 | 31.6 ± 14.4 | 0.904 |
| Contralateral optic nerve | Dmax (Gy) | 35.1± 19 | 31.7 ± 17.3 | 0.659 |
| Ipsilateral Eye | Dmean (Gy) | 18.4 ± 11.6 | 15.5 ± 10.5 | 0.042 |
| Contralateral Eye | Dmean (Gy) | 16.8 ± 14.1 | 13.1 ± 12.2 | 0.172 |
| Ipsilateral Cochlea | Dmean (Gy) | 10.7 ± 13.4 | 5.9 ± 9.1 | 0.485 |
| Contralateral Cochlea | Dmean (Gy) | 16.9 ± 21.1 | 8.6 ± 15.9 | 0.432 |
| Ipsilateral Lens | Dmax (Gy) | 2.7 ± 2.3 | 2.9 ± 1.5 | 0.002 |
| Contralateral Lens | Dmax (Gy) | 1.5 ± 2.1 | 1.6± 2.2 | 0.001 |