Table 2 The changes of dose-volumetric indicators according to the magnitudes of MLC misalignments in lung SBRT plans
Percent differences compared to the original plan (%) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
MLC error (mm) | Class | Target | Organs at risk | ||||||||
V90% | D95% | Mean | Trachea Max | SC Max | Rib Max | Lung V12.4Gy | Lung V11.6Gy | Heart Max | Esophagus Max | ||
N | 10 | 10 | 10 | 7 | 10 | 9 | 10 | 10 | 10 | 10 | |
0.25 | Out | 1.2 ± 1.3 | 1.9 ± 0.9 | 1.5 ± 0.6 | 2.5 ± 1.5 | 1.7 ± 0.7 | 2.3 ± 1.0 | 16.7 ± 12.0 | -1.1 ± 31.2 | 2.8 ± 1.2 | 2.4 ± 0.8 |
In | -1.7 ± 1.5 | -1.9 ± 0.9 | -1.5 ± 0.6 | -2.9 ± 1.7 | -1.7 ± 0.6 | -1.8 ± 1.0 | -18.1 ± 15.7 | -8.9 ± 4.4 | -2.2 ± 1.0 | -2.3 ± 0.8 | |
0.5 | Out | 2.0 ± 2.4 | 3.8 ± 1.7 | 3.1 ± 1.3 | 5.4 ± 3.1 | 3.5 ± 1.1 | 4.4 ± 1.9 | 33.1 ± 22.8 | 9.3 ± 35.5 | 5.4 ± 2.2 | 4.8 ± 1.7 |
In | -4.0 ± 3.1 | -3.9 ± 1.6 | -3.1 ± 1.2 | -5.6 ± 3.0 | -12.2 ± 27.4 | -4.0 ± 1.9 | -33.6 ± 25.3 | -17.9 ± 8.8 | -5.0 ± 1.8 | -4.5 ± 1.5 | |
1 | Out | 2.7 ± 3.4 | 6.6 ± 2.9 | 5.6 ± 2.3 | 9.1 ± 5.7 | 6.1 ± 1.6 | 7.6 ± 3.2 | 40.1 ± 56.1 | 21.3 ± 40.7 | 9.4 ± 4.0 | 7.9 ± 2.9 |
In | -10.1 ± 6.4 | -7.1 ± 2.8 | -5.6 ± 2.2 | -9.1 ± 5.1 | -5.8 ± 1.3 | -7.0 ± 3.2 | -50.3 ± 29.6 | -32.8 ± 16.8 | -8.5 ± 3.1 | -7.5 ± 2.8 | |
Shift | -0.4 ± 1.8 | -1.3 ± 2.2 | 0.1 ± 0.6 | -1.3 ± 4.1 | 0.4 ± 1.4 | 0.9 ± 1.5 | 1.3 ± 5.6 | -0.5 ± 2.0 | 0.1 ± 2.0 | -2.0 ± 6.0 | |
2 | Out | 3.4 ± 4.6 | 12.3 ± 5.4 | 10.9 ± 4.5 | 17.8 ± 11.1 | 12.5 ± 3.0 | 15.8 ± 7.9 | 85.6 ± 86.9 | 49.8 ± 54.7 | 19.0 ± 8.1 | 15.6 ± 5.6 |
In | -40.0 ± 19.2 | -15.1 ± 5.6 | -11.5 ± 4.4 | -17.2 ± 9.0 | -11.8 ± 2.7 | -13.8 ± 6.3 | -68.8 ± 35.1 | -62.0 ± 30.6 | -17.5 ± 6.5 | -14.7 ± 4.9 | |
Shift | -2.4 ± 3.4 | -3.0 ± 3.3 | -0.1 ± 1.1 | -2.1 ± 6.5 | 0.7 ± 2.6 | 2.5 ± 3.7 | 2.8 ± 9.5 | -2.8 ± 5.5 | 0.1 ± 4.3 | -0.7 ± 1.7 | |
3 | Shift | -6.9 ± 5.4 | -6.8 ± 5.6 | -1.1 ± 1.8 | -3.1 ± 8.7 | 1.4 ± 4.4 | 5.1 ± 6.0 | 1.1 ± 12.8 | -5.4 ± 7.0 | 0.4 ± 7.2 | -1.2 ± 2.5 |