Table 2 Collimator scatter factors. Monte Carlo S_c are corrected for the MBSF, using the published factors for TrueBeam (the original simulation), and for Clinac (according to the measurements, to compare with real measurements). Measurements (on a Clinac treatment unit) refer to Mini-Phantom data acquired with a Farmer ion chamber at 10 cm depth of PMMA

4 × 4 cm²

0.962 ± 0.008

0.957 ± 0.005

0.961 ± 0.008

0.955 ± 0.005

0.955 ± 0.003

0.946 ± 0.002

5 × 5 cm²

0.969 ± 0.008

0.965 ± 0.005

0.969 ± 0.008

0.964 ± 0.005

0.968 ± 0.003

0.961 ± 0.002

10 × 10 cm²

1.000 ± 0.008

1.000 ± 0.005

1.000 ± 0.008

1.000 ± 0.005

1.000 ± 0.003

1.000 ± 0.002

20 × 20 cm²

1.020 ± 0.008

1.024 ± 0.005

1.024 ± 0.008

1.029 ± 0.005

1.026 ± 0.003

1.024 ± 0.002

30 × 30 cm²

1.026 ± 0.008

1.035 ± 0.005

1.033 ± 0.008

1.044 ± 0.005

1.040 ± 0.003

1.038 ± 0.002

40 × 40 cm²

1.027 ± 0.008

1.035 ± 0.005

1.038 ± 0.008

1.050 ± 0.005

1.050 ± 0.003

1.050 ± 0.002