From: Optimal collimator rotation based on the outline of multiple brain targets in VMAT
Structure | DV parametera | Std-VMAT | Colli-VMATPre (40°) | Colli-VMATPre (60°) | Colli-VMAT (40°) | Colli-VMAT (60°) |
---|---|---|---|---|---|---|
Target volume | D99%b (Gy) | 28.8 ± 11.9 | 28.6 ± 11.6 | 28.7 ± 11.7 | 28.6 ± 11.6 | 28.7 ± 11.7 |
D95% (Gy) | 29.4 ± 12.4 | 29.2 ± 12.2 | 29.3 ± 12.4 | 29.3 ± 12.2 | 29.4 ± 12.2 | |
D5% (Gy) | 32.3 ± 15.4 | 32.4 ± 15.1 | 32.3 ± 15.4 | 32.4 ± 15.1 | 32.2 ± 15.0 | |
D1% (Gy) | 32.6 ± 15.7 | 32.7 ± 15.2 | 32.6 ± 15.5 | 32.7 ± 15.2 | 32.4 ± 15.1 | |
Minimum dose (Gy) | 21.4 ± 10.0 | 22.0 ± 10.1 | 21.4 ± 10.0 | 22.1 ± 9.9 | 21.1 ± 10.1 | |
Maximum dose (Gy) | 33.2 ± 14.3. | 33.1 ± 14.4 | 33.2 ± 15.3. | 33.0 ± 15.4 | 33.1 ± 15.3 | |
Mean dose (Gy) | 31.1 ± 15.0 | 31.4 ± 14.4 | 31.4 ± 15.0 | 31.4 ± 15.3 | 31.3 ± 15.4 | |
Conformity index | 0.8 ± 0.1 | 0.8 ± 0.1 | 0.8 ± 0.1 | 0.8 ± 0.1 | 0.8 ± 0.1 | |
Homogeneity index | 0.09 ± 0.02 | 0.10 ± 0.06 | 0.09 ± 0.03 | 0.10 ± 0.04 | 0.10 ± 0.02 | |
Gradient measure (cm) | 1.3 ± 0.2 | 1.4 ± 0.1 | 1.3 ± 0.1 | 1.4 ± 0.1 | 1.3 ± 0.1 | |
Normal brain - PTV | V5 Gyc (cc) | 776.6 ± 316.3 | 778.0 ± 320.1 | 783.4 ± 320.4 | 764.6 ± 318.2 | 766.0 ± 313.3 |
V12 Gy (cc) | 454.5 ± 333.4 | 443.3 ± 340.7 | 448.7 ± 342.9 | 439.5 ± 341.1 | 441.1 ± 335.8 | |
V15 Gy (cc) | 357.3 ± 333.4 | 351.5 ± 340.7 | 356.7 ± 342.9 | 347.5 ± 341.1 | 348.5 ± 335.8 | |
Mean dose (Gy) | 13.4 ± 9.9 | 13.3 ± 10.0 | 13.4 ± 10.0 | 13.2 ± 10.1 | 13.1 ± 9.7 | |
Spinal cord | Maximum dose (Gy) | 3.6 ± 2.0 | 3.2 ± 2.8 | 3.1 ± 2.2 | 1.8 ± 2.5 | 3.1 ± 2.9 |
Brain stem | Maximum dose (Gy) | 26.6 ± 15.3 | 26.6 ± 16.6 | 26.6 ± 16.7 | 26.4 ± 16.5 | 26.3 ± 15.9 |
Optic chiasm | Maximum dose (Gy) | 26.4 ± 11.5 | 25.7 ± 11.5 | 25.5 ± 11.6 | 25.0 ± 12.0 | 25.3 ± 11.3 |
Right optic nerve | Maximum dose (Gy) | 19.6 ± 16.8 | 18.5 ± 16.3 | 18.4 ± 16.9 | 17.7 ± 16.8 | 18.0 ± 17.0 |
Left optic nerve | Maximum dose (Gy) | 19.6 ± 17.5 | 17.8 ± 16.6 | 18.4 ± 17.0 | 17.6 ± 16.8 | 18.2 ± 17.5 |
Right lens | Maximum dose (Gy) | 3.5 ± 2.2 | 3.4 ± 3.0 | 3.4 ± 2.8 | 3.0 ± 3.1 | 3.0 ± 2.0 |
Left lens | Maximum dose (Gy) | 3.1 ± 1.9 | 3.0 ± 2.0 | 3.2 ± 2.3 | 2.8 ± 2.0 | 3.0 ± 1.7 |
Right parotid | Mean dose (Gy) | 0.9 ± 1.2 | 0.8 ± 1.3 | 0.8 ± 1.2 | 0.7 ± 1.1 | 0.8 ± 1.2 |
Left parotid | Mean dose (Gy) | 1.0 ± 1.2 | 1.1 ± 1.2 | 1.1 ± 1.0 | 1.1 ± 1.2 | 1.1 ± 1.0 |