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Table 2 Collimator scatter factors. Monte Carlo Sc 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

From: Collimator scatter factor: Monte Carlo and in-air measurements approaches

Field size Monte Carlo Monte Carlo Measurements
Sc 6MV, TrueBeam MBSF Sc 15MV, TrueBeam MBSF Sc 6MV, Clinac MBSF Sc 15MV, Clinac MBSF Sc 6MV Sc 18MV
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