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Table 3 The simulated and measured relative output factors of various field sizes

From: Monte Carlo simulation of beam characteristics from small fields based on TrueBeam flattening-filter-free mode

Field size (cm2) 6 FFF 10 FFF
Measured Simulated %Diff. Measured Simulated %Diff.
1 × 1 0.684 0.717 4.82 0.697 0.721 3.40
2 × 2 0.801 0.807 0.80 0.845 0.848 0.34
3 × 3 0.842 0.849 0.82 0.894 0.895 0.10
4 × 4 0.875 0.873 −0.17 0.921 0.926 0.52
6 × 6 0.929 0.932 0.25 0.956 0.962 0.66
10 × 10 1.000 1.000 1.000 1.000
20 × 20 1.080 1.073 −0.66 1.049 1.045 −0.36
40 × 40 1.122 1.117 −0.47 1.069 1.063 −0.58