Table 3 Dose–volume analysis for planning target volume and organs at risk
Volume | Parameter | Mean ± SD |
|---|---|---|
PTV | Mean dose | 60.8 ± 2.7 Gy |
Minimum dose | 43.6 ± 9.4 Gy | |
Maximum dose | 65.6 ± 4.2 Gy | |
V95% | 97.9± 2.5% | |
Homogeneity index (D5/D95) | 1.1 ± 0 (Range 1.0 - 1.2) | |
Optic chiasm | Mean dose | 30.4 ± 7.2 Gy |
Maximum dose | 40.5 ± 7.6 Gy | |
V40 | 13.9 ± 15.9% | |
V45 | 0.8% ± 1.9% | |
V47.25 | 0% | |
V50 | 0% | |
Left optic nerve | Mean dose | 18.3 ± 8.0 Gy |
Maximum dose | 29.5 ± 11.1 Gy | |
V40 | 3.6 ± 9.1% | |
V47.25 | 0.1 ± 0.3% | |
V50 | 0 | |
Right optic nerve | Mean dose | 23.4 ± 10.3 Gy |
Maximum dose | 34.6 ± 11.5 Gy | |
V40 | 13.6 ± 21.8% | |
V47.25 | 0% | |
V50 | 0% | |
Brainstem | Mean dose | 22.8 ± 10.2 Gy |
Maximum dose | 50.7 ± 10.3 Gy | |
V40 | 19.8 ± 19% | |
V50 | 4.5 ± 7.4% | |
V52.5 | 1.3 ± 3% | |
V55 | 0.4 ± 1% | |
Spinal cord | Mean dose | 1.2 ± 0.8 Gy |
Maximum dose | 3.1 ± 2.4 Gy | |
V40 | 0% | |
V42 | 0% | |
Left eye | Mean dose | 5.2 ± 2.8 Gy |
Maximum dose | 11.1 ± 4.1 Gy | |
V10.5 | 5 ± 17.7% | |
Right eye | Mean dose | 5.7 ± 3.7 Gy |
Maximum dose | 13.3 ± 6.4 Gy | |
V10.5 | 5.6 ± 17% |