Table 3 Calculated CTV–PTV margins in 3-dimensions
Margin | RL (mm) | AP (mm) | SI (mm) |
|---|---|---|---|
Initial inter-fraction | |||
 Overall | 5.8 | 9.4 | 8.3 |
 BMI > 25.9 kg/m2 | 5.9 | 9.8 | 8.3 |
 BMI ≤25.9 kg/m2 | 5.4 | 7.4 | 8.2 |
Residual inter-fraction | |||
 Overall | 4.0 | 5.5 | 4.7 |
 BMI > 25.9 kg/m2 | 3.1 | 4.4 | 3.7 |
 BMI ≤25.9 kg/m2 | 4.8 | 6.4 | 5.6 |
Intra-fraction | |||
 Overall | 2.9 | 3.3 | 3.4 |
 BMI > 25.9 kg/m2 | 2.9 | 3.3 | 3.1 |
 BMI ≤25.9 kg/m2 | 3.0 | 3.2 | 3.7 |
Total without CBCT correction | |||
 Overall | 6.5 | 10.2 | 8.9 |
 BMI > 25.9 kg/m2 | 6.6 | 10.3 | 8.8 |
 BMI ≤25.9 kg/m2 | 6.3 | 8.3 | 9.1 |
Total with CBCT correction | |||
 Overall | 4.7 | 6.3 | 5.4 |
 BMI > 25.9 kg/m2 | 4.3 | 5.4 | 4.7 |
 BMI ≤25.9 kg/m2 | 5.6 | 7.2 | 6.8 |