TABLE 2.
Couch position tolerance limits based on treatment sites
| Name | Lateral (cm) | Longitudinal (cm) | Vertical (cm) | Angle | Pedestal | Clinical examples |
|---|---|---|---|---|---|---|
| HN | 1.5 | 1.5 | 1.0 | Brain immobilized with mask | ||
| HN‐CBCT | 1.5 | 1.0 | 1.0 | 3 | 0.1 | HN |
| Body | 3.0 | 3.0 | 1.5 | 1.0 | 0.1 | Breast, electron plans based on CT |
| Body‐CBCT | 3.0 | 3.0 | 1.0 | 3 | 0.1 | Thoracic, abdominal, and prostate cases |
| SBRT‐body | 2.0 | 2.0 | 1.5 | 3 | 0.1 | Lung, liver, spine Mets |
| Electron‐clinical setup | 10.0 | 20.0 | 3.0 | Clinical setup without CT planning |
Abbreviations: HN‐CBCT, head and neck cone‐beam CT; SBRT, stereotactic body radiotherapy.