Skip to main content

Table 2 The simulated and measured profiles penumbras (mm) of various field sizes at 10 cm depth

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 2.4 2.0 0.4 3.2 2.7 0.5
2 × 2 2.6 2.2 0.4 3.6 3.3 0.3
3 × 3 2.7 2.4 0.3 3.8 3.4 0.4
4 × 4 2.9 2.8 0.1 3.9 3.7 0.2
6 × 6 3.2 3.0 0.2 4.1 4.0 0.1
10 × 10 3.6 3.6 0.0 4.5 4.5 0.0
20 × 20 5.1 5.1 0.0 5.4 5.4 0.0
40 × 40 8.3 8.6 −0.3 6.6 7.0 −0.4