Table 2.
Residual Setup Error Characteristics: Assessment of Differences Between Planar kV and CBCT in 3 Dimensions (mm).
| Direction | M | Σ | σ |
|---|---|---|---|
| CBCT | |||
| LR | 0.10 | 0.00 | 0.55 |
| AP | −0.22 | −0.20 | 0.45 |
| SI | 0.04 | 0.00 | 0.53 |
| Planar kV | |||
| LR | 0.85 | −0.20 | 1.10 |
| AP | 1.03 | 0.50 | 1.34 |
| SI | 0.42 | 0.00 | 1.10 |
Abbreviations: AP, anteroposterior (posterior = negative, anterior = positive); LR, lateral (left = negative, right = positive); M, mean setup error; SI, superoinferior (inferior = negative, superior = positive); Σ, systematic setup error; σ, random setup error.