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