Table 3 Mean absolute difference and standard deviation of the OARs DVH dosimetric parameters in the 11 cases studied
From: Impact of positioning errors in the dosimetry of VMAT left-sided post mastectomy irradiation
Perturbation | Left Lung | Heart | |||||
|---|---|---|---|---|---|---|---|
Shift | Direction | a∆ V20 | a∆ V40 | b∆ Dm | a∆ V25 | a∆ V40 | b∆ Dm |
3 mm | inferior | 1.9 ± 0.6 | 1.6 ± 0.5 | 1.0 ± 0.1 | 0.2 ± 0.2 | 0.1 ± 0.1 | 0.0 ± 0.1 |
superior | − 2.5 ± 0.5 | − 1.2 ± 0.7 | − 0.8 ± 0.1 | − 0.2 ± 0.1 | − 0.1 ± 0.1 | − 0.2 ± 0.2 | |
posterior | 2.4 ± 0.5 | 2.5 ± 0.5 | 1.1 ± 0.1 | 1.6 ± 1.1 | 0.4 ± 0.2 | 0.8 ± 0.2 | |
right | 2.6 ± 0.5 | 2.3 ± 0.7 | 1.2 ± 0.4 | 0.6 ± 0.2 | 0.3 ± 0.3 | 0.2 ± 0.2 | |
left | − 2.9 ± 0.8 | − 1.9 ± 0.8 | −1.0 ± 0.3 | − 0.5 ± 0.1 | − 0.2 ± 0.2 | − 0.4 ± 0.2 | |
anterior | − 3.0 ± 0.8 | − 1.8 ± 0.3 | −1.0 ± 0.1 | −1.8 ± 0.5 | − 0.2 ± 0.1 | − 0.6 ± 0.2 | |
5 mm | inferior | 3.5 ± 0.5 | 3.1 ± 0.8 | 1.5 ± 0.2 | 0.6 ± 0.9 | 0.3 ± 0.1 | 0.3 ± 0.2 |
superior | − 3.6 ± 0.5 | −1.8 ± 0.9 | −1.2 ± 0.2 | −0.8 ± 0.7 | −0.2 ± 0.1 | −0.4 ± 0.2 | |
posterior | 4.1 ± 0.6 | 4.2 ± 0.7 | 1.7 ± 0.5 | 3.0 ± 1.2 | 1.3 ± 0.8 | 1.4 ± 0.4 | |
right | 4.3 ± 1.3 | 4.1 ± 1.3 | 2.0 ± 0.4 | 0.9 ± 1.0 | 0.4 ± 0.2 | 0.3 ± 0.2 | |
left | − 4.5 ± 1.1 | −3.0 ± 1.7 | −1.6 ± 0.4 | −0.8 ± 0.7 | −0.3 ± 0.3 | −0.5 ± 0.3 | |
anterior | −5.6 ± 1.6 | − 4.1 ± 2.5 | −1.7 ± 0.2 | − 2.5 ± 1.3 | −0.3 ± 0.2 | − 1.0 ± 0.5 | |
10 mm | inferior | 7.1 ± 1.4 | 6.5 ± 1.1 | 3.1 ± 0.6 | 1.1 ± 1.0 | 0.5 ± 0.3 | 0.2 ± 0.2 |
superior | −6.5 ± 1.5 | −2,7 ± 1.1 | −2.2 ± 0.4 | −1.0 ± 1.0 | −0.4 ± 0.2 | −0.2 ± 0.1 | |
posterior | 8.4 ± 1.2 | 8.4 ± 1.6 | 3.7 ± 0.5 | 7.0 ± 2.2 | 3.6 ± 2.6 | 3.0 ± 0.9 | |
right | 9.8 ± 1.8 | 8.5 ± 2.5 | 4.1 ± 0.8 | 2.1 ± 1.2 | 0.7 ± 0.4 | 0.4 ± 0.2 | |
left | − 8.5 ± 1.8 | − 4.13 ± 2.4 | −2.8 ± 0.9 | −1.4 ± 1.1 | −0.4 ± 0.2 | −1.1 ± 0.9 | |
anterior | −9.6 ± 1.8 | −4,2 ± 2.4 | −3-0 ± 0.4 | −3.4 ± 2.6 | − 1.1 ± 0.9 | −2.3 ± 1.0 | |