Table 2.
Dosimetric analysis of organs at risk
| Organs at risk | Dose (Gy) | Median | interquartile range | ||
|---|---|---|---|---|---|
| Hippocampus | |||||
| Contralateral | Vol (cc) | 1.70 | 1.40 | – | 2.15 |
| D100% | 6.71 | 2.96 | – | 9.70 | |
| Dmax | 16.10 | 13.30 | – | 16.85 | |
| Dmean | 10.94 | 7.59 | – | 12.58 | |
| Dmean (EQD2/2) | 6.59 | 4.27 | – | 7.61 | |
| Ipsilaterala | Vol (cc) | 1.50 | 1.05 | – | 1.80 |
| D100% | 8.44 | 2.66 | – | 16.69 | |
| Dmax | 46.69 | 16.70 | – | 57.52 | |
| Dmean | 19.70 | 8.54 | – | 38.86 | |
| Dmean (EQD2/2) | 13.22 | 4.89 | – | 32.62 | |
| Bilaterala | Dmean | 15.15 | 8.31 | – | 25.01 |
| Dmean (EQD2/2) | 9.59 | 4.75 | – | 18.44 | |
| Optic chiasm | Dmax | 36.60 | 18.85 | – | 50.70 |
| Optic nerve | Dmax | 14.90 | 2.37 | – | 46.99 |
| Brain stem | Dmax | 51.77 | 22.40 | – | 59.54 |
| Eyeballs | Dmax | 6.18 | 1.99 | – | 21.81 |
| Lenses | Dmax | 2.08 | 0.93 | – | 5.19 |
Abbreviations: EQD2/2 equivalent dose in 2-Gy fraction assuming alpha-beta ratio of 2 Gy
aExcluded for analysis if whole ipsilateral hippocampus was included within the planning target volume