Table 1 Description of 21 plans

# Beams

2 (all plans)

Minimum segment size

2 × 2 cm² (all plans)

Minimum monitor units (MUs) per segment

5 MU (all plans)

Mean (range) # segments

35 ± 7 (19–46)

Mean (range) equivalent square side (cm)

8.6 ± 0.8 (7.4–10.2)

Dose–volume constraint of PTV: D_95%

≥95% (47.5 Gy)

Dose–volume constraint of ipsi. lung: V_20Gy

< 15% (per protcol), < 20% (variation acceptable)

Dose–volume constraint of heart: D_mean

< 4 Gy