Table 3.
Median radiation doses to cavernous sinus, optic nerves and chiasm in patients treated with multi-fraction SRS (5 × 5 Gy)
| Site | Median | Maximum | Organ at risk | Volume (cm 3 ) | Volume (cm 3 ) |
|---|---|---|---|---|---|
| |
dose |
dose |
volume |
receiving |
receiving |
| |
(Gy) |
(Gy) |
(cm3) |
a dose > 25.0 Gy |
a dose > 27.5 Gy |
| Cavernous sinus |
18.5 |
29 |
1.9 (1.44-2.52) |
1.7 (1.41-2.4) |
0.52 (0.2-1.9) |
| Optic nerve |
13.5 |
28.5 |
0.93 (0.71-1.26) |
0.08 (0.01-0.5) |
0.026 (0.005-0.08) |
| Optic chiasm | 5.5 (12*) | 28.5 | 0.48 (0.33-0.71) | 0.13 (0.03-0.28)* | 0.022 (0.01-0.06)* |
*In 18 patients receiving a total dose to the optic chiasm >25 Gy.