Table 2.
Population setup errors
| Tomotherapy | ||||
|---|---|---|---|---|
| M | Σ | σ | ||
| All patients | ||||
| Mediolateral | −0.4 | 3.1 | 2.2 | |
| Craniocaudal | 2.0 | 1.6 | 1.7 | |
| Anteroposteriora | 0.8 | 1.3 | 1.7 | |
| Main sites: | ||||
| Nasopharynx | ||||
| Mediolateral | 1.5 | 2.8 | 2.6 | |
| Craniocaudal | 1.2 | 1.1 | 2.5 | |
| Anteroposteriora | 0.7 | 1.8 | 1.5 | |
| Oropharynx | ||||
| Mediolateral | −1.6 | 2.9 | 2.5 | |
| Craniocaudal | 1.8 | 1.4 | 1.6 | |
| Anteroposteriora | 0.7 | 1.4 | 1.9 | |
| Hypopharynx | ||||
| Mediolateral | −0.3 | 3.4 | 1.7 | |
| Craniocaudal | 2.6 | 1.7 | 1.6 | |
| Anteroposteriora | 1.1 | 0.9 | 1.3 | |
| Oral cavity | ||||
| Mediolateral | 1.2 | 1.5 | 1.4 | |
| Craniocaudal | 2.0 | 1.4 | 1.3 | |
| Anteroposteriora | 0.5 | 1.2 | 1.6 | |
| Other | ||||
| Mediolateral | 2.0 | 3.3 | 1.9 | |
| Craniocaudal | 4.6 | 3.0 | 1.5 | |
| Anteroposteriora | 1.7 | 1.5 | 1.3 | |
aAntero-Posterior correction of 3.8 mm is applied for the systematic AP setup error caused by couch sag