Table 3 The changes of dose-volumetric indicators according to the magnitudes of MLC misalignments in spine SBRT plans
Percent differences compared to the original plan (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
MLC error (mm) | Class | Target | Organs at risk | ||||||
V100% | D95% | Mean | SC V10Gy | Esophagus Max | Cauda equina V14Gy | Brainstem Max | Bowel Max | ||
N | 8 | 10 | 10 | 3 | 2 | 1 | 1 | 5 | |
0.25 | Out | 5.1 ± 2.2 | 2.4 ± 1.2 | 1.6 ± 0.7 | 28.5 ± 9.2 | 4.0 ± 1.0 | 133 | 7.4 | 1.4 ± 0.3 |
In | -6.6 ± 4.8 | -1.9 ± 1.2 | -1.6 ± 0.7 | -22.9 ± 3.7 | -5.5 ± 3.2 | -45.9 | -1.9 | -1.3 ± 0.4 | |
0.5 | Out | 10.0 ± 5.1 | 4.5 ± 2.2 | 3.1 ± 1.4 | 58.9 ± 13.4 | 10.3 ± 5.3 | 356.3 | 12.1 | 2.7 ± 0.7 |
In | -15.0 ± 7.7 | -4.1 ± 2.3 | -3.2 ± 1.4 | -44.7 ± 6.8 | -10.9 ± 7.0 | -70.5 | -7.4 | -2.7 ± 0.7 | |
1 | Out | 16.7 ± 9.3 | 7.2 ± 3.6 | 5.6 ± 2.5 | 113.9 ± 28.3 | 20.5 ± 12.2 | 610.6 | 19.5 | 4.8 ± 1.3 |
In | -32.2 ± 13.6 | -7.7 ± 4.0 | -5.8 ± 2.6 | -71.7 ± 7.4 | -19.0 ± 11.5 | -91.8 | -14.8 | -4.8 ± 1.3 | |
Shift | 0.2 ± 1.5 | 1.1 ± 1.2 | 0.2 ± 0.3 | 36.8 ± 18.7 | -9.6 ± 11.3 | 123.9 | 11.8 | -2.4 ± 1.5 | |
2 | Out | 28.5 ± 18.2 | 13.3 ± 6.4 | 10.9 ± 5.0 | 244.4 ± 41.9 | 45.0 ± 30.0 | 910.4 | 36.8 | 10.3 ± 1.8 |
In | -65.5 ± 22.5 | -16.6 ± 8.3 | -11.8 ± 5.2 | -98 ± 1.9 | -33.8 ± 18.0 | -100 | -30.1 | -9.3 ± 2.5 | |
Shift | -2.3 ± 2.8 | -0.2 ± 1.9 | -0.1 ± 0.7 | 66.4 ± 16.3 | -15.2 ± 16.9 | 346.1 | 19.9 | -4.3 ± 1.9 | |
3 | Shift | -5.4 ± 5.3 | -3.3 ± 3.7 | -0.8 ± 1.1 | 109.3 ± 23.5 | -19.6 ± 20.0 | 628.3 | 27.6 | -5.3 ± 2.5 |