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Comparison of CBCT and kV calculated shifts with expected shifts
| Bite‐block Tilt Angle (°) | Expected Couch Vertical Correction (mm) | Couch Vertical Correction by kV‐kV (mm) | Couch Vertical Correction by CBCT (mm) | Deviation Between kV‐kV and CBCT (mm) |
|---|---|---|---|---|
| 0.5 | 1 | 1 | 1 | 0 |
| 1 | 2 | 3 | 2 | 1 |
| 1.5 | 3 | 4 | 3 | 1 |
| 2 | 4 | 5 | 4 | 1 |
| 3 | 6 | 8 | 6 | 2 |
