Table 1.
Target motion according to non-rigid and rigid approximation. Margins calculated for rigid approximation data to account for the observed errors using van Herk’s formula and PTV margins calculated to encompass the population target motion and set-up error.
| Movement | DVF displacement (mm) |
Rigid translation (mm) |
Setup error (mm) |
Rigid data CTVv to PTV (mm) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean of mean | Σ | σ | Range | Mean of mean | Σ | σ | Range | Margin | Σ | σ | Margin | Margin | |
| Right | −2.7 | 2.5 | 2.4 | –22.8–19.1 | −0.5 | 1.9 | 2.2 | −20.0–21.6 | 6.6 | 2.1 | 3.3 | 7.6 | 10.1 |
| Left | −1.4 | 2.2 | 2.6 | −21.1–18.1 | −1.5 | 2.9 | 2.2 | −29.2–20.3 | 8.8 | 2.1 | 3.3 | 7.6 | 11.4 |
| Anterior | −2.5 | 3.4 | 4.0 | −29.3–30 | −0.4 | 4.1 | 3.8 | −27.0–23.4 | 12.9 | 1.1 | 2.0 | 4.2 | 13.5 |
| Posterior | 1.0 | 4.0 | 3.9 | −29.6–27.2 | −1.0 | 3.9 | 3.1 | −26.3–23.4 | 12.1 | 1.1 | 2.0 | 4.2 | 12.2 |
DVF = Deformation vector field.