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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

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Radiation Oncology

ISSN: 1748-717X

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