Table 3 Calculated setup margins in dependence of the setup procedure for each scenario.
Setup type | Skin marks | OSMS | Skin marks | OSMS | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Error type | Inter-fractional error (mm) | Intra-fractional error (mm) | Combined inter- and intra-fractional error (mm) | |||||||||||||
Anatomical region of the target volume | Frequency of online verifications using kV-CBCT | LAT | LNG | VRT | LAT | LNG | VRT | LAT | LNG | VRT | LAT | LNG | VRT | LAT | LNG | VRT |
Head and neck (closed mask) | None | 3 | 3 | 2 | – | – | – | – | – | – | – | – | – | – | – | – |
Head and neck (open mask) | None | – | – | – | 2 | 2 | 2 | 1 | 1 | 1 | – | – | – | 2 | 3 | 2 |
Thorax | None | 4 | 6 | 6 | 3 | 5 | 4 | 2 | 2 | 1 | 5 | 6 | 6 | 3 | 5 | 4 |
Abdomen | None | 4 | 7 | 7 | 2 | 5 | 3 | 1 | 3 | 2 | 5 | 8 | 7 | 3 | 6 | 3 |
Pelvis | None | 6 | 6 | 3 | 2 | 6 | 3 | 1 | 2 | 1 | 6 | 6 | 4 | 3 | 7 | 4 |
Mean setup margin (thorax/abdomen/pelvis) | None | 5 | 6 | 5 | 3 | 5 | 3 | 1 | 2 | 1 | 5 | 7 | 6 | 3 | 6 | 4 |
Mean setup margin (LAT/LNG/VRT) | None | 5.5 | 3.6 | 1.6 | 5.9 | 4.2 | ||||||||||
Head and neck (closed mask) | Once per week | 2 | 2 | 2 | – | – | – | – | – | – | – | – | – | – | – | – |
Head and neck (open mask) | Once per week | – | – | – | 1 | 2 | 1 | 1 | 1 | 1 | – | – | – | 2 | 2 | 2 |
Thorax | Once per week | 4 | 5 | 5 | 2 | 4 | 3 | 2 | 2 | 1 | 4 | 6 | 5 | 3 | 5 | 3 |
Abdomen | Once per week | 3 | 5 | 5 | 2 | 4 | 2 | 1 | 3 | 2 | 4 | 6 | 6 | 2 | 5 | 3 |
Pelvis | Once per week | 4 | 4 | 3 | 2 | 5 | 2 | 1 | 2 | 1 | 5 | 5 | 3 | 2 | 6 | 3 |
Mean setup margin (thorax/abdomen/pelvis) | Once per week | 4 | 5 | 4 | 2 | 4 | 3 | 1 | 2 | 1 | 4 | 6 | 5 | 3 | 5 | 3 |
Mean setup margin (LAT/LNG/VRT) | Once per week | 4.3 | 3.0 | 1.6 | 4.8 | 3.7 | ||||||||||
Head and neck (closed mask) | Every other day | 1 | 1 | 1 | – | – | – | – | – | – | – | – | – | – | – | – |
Head and neck (open mask) | Every other day | – | – | – | 1 | 1 | 1 | 1 | 1 | 1 | – | – | – | 1 | 2 | 1 |
Thorax | Every other day | 2 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 1 | 3 | 4 | 4 | 3 | 3 | 2 |
Abdomen | Every other day | 2 | 3 | 3 | 2 | 3 | 2 | 1 | 3 | 2 | 3 | 5 | 4 | 2 | 4 | 3 |
Pelvis | Every other day | 5 | 3 | 1 | 1 | 2 | 2 | 1 | 2 | 1 | 5 | 4 | 2 | 2 | 3 | 2 |
Mean setup margin (thorax/abdomen/pelvis) | Every other day | 3 | 3 | 3 | 2 | 3 | 2 | 1 | 2 | 1 | 3 | 4 | 3 | 2 | 4 | 2 |
Mean setup margin (LAT/LNG/VRT) | Every other day | 2.9 | 2.0 | 1.6 | 3.6 | 2.8 |
