Table 2.
Plan characteristics
| Meningioma | EQD22 (Gy) | Pituitary adenoma | EQD210 (Gy) | |||
|---|---|---|---|---|---|---|
| No of plan | 11 | 10 | ||||
| Tumor | ||||||
| Volume of PTV (cm3) |
8.06 ± 2.45 |
9.53 ± 1.75 |
||||
| Prescribed dose | 5 | 30 Gy/5 fr. | 40 | 4 | 25 Gy/5 fr. | 31.3 |
| 1 | 16 Gy/1 fr. | 34.6 | 2 | 21 Gy/3 fr. | 29.8 | |
| 1 | 21 Gy/3 fr. | 29.8 | 1 | 22.5 Gy/3 fr. | 32.8 | |
| 1 | 24 Gy/5 fr. | 29.6 | 2 | 24 Gy/5 fr. | 29.6 | |
| 1 | 23 Gy/3 fr. | 33.9 | 1 | 24 Gy/3 fr. | 36 | |
| 1 | 24 Gy/3 fr. | 36 | ||||
| s | ||||||
| Minimal dose/prescribed dose (%) |
83.7 ± 9 range 72 - 90 |
80 ± 12 range 60 - 99 |
||||
| Maximal dose/prescribed dose (%) |
122 ± 15 range 110 - 157 |
129 ± 17 range 105 - 157 |
||||
| OARs | ||||||
| (Gy) | ||||||
| Left eye | 0.12 - 2.25 | 0.02 - 4.48 | ||||
| Right eye | 3.07 - 18.6 | 0.05 - 4.52 | ||||
| Brain stem | 4.97 - 15.4 | 4.5 - 19.5 | 17.3 - 24.74 | 30.0 - 42.9 | ||
| Optic chiasm | 4.61 - 15.4 | 4.1 -- 19.9 | 16.6 - 26.4 | 22 -- 48 | ||
| Left lens | 0.01 - 2.00 | 0.03 - 4.08 | ||||
| Right lens | 0.88 - 6.68 | 0.13 - 3.81 | ||||
| Left optic nerve | 0.79 - 8.96 | 0.4 - 8.5 | 12.4 - 23.4 | 23 - 50 | ||
| Right optic nerve | 7.93 -- 26.4 | 14.6 - 47.9 | 0.37 - 23.4 | 17.5 -- 57.5 | ||
EQD2 = n × d × (α/β+d)/(α/β+2), EQD210; α/β = 10 for PTV and EQD22; α/β = 2 for organs at risk
OARs; organs at risk, fr.; fraction