Table 5 Average penumbra (mm) for 6MV flattened and unflattened beams (reproduced with permission from MedEuropa)
Beam type | Field size (cm2) | Right Penumbra (mm) | Left Penumbra (mm) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Reference | Linac 1 | Linac 2 | Linac 3 | Reference | Linac 1 | Linac 2 | Linac 3 | ||
6MV FFF | 3 × 3 | 4.27 | 4.77 | 4.46 | 4.36 | 4.27 | 4.70 | 4.43 | 4.39 |
5 × 5 | 6.39 | 6.40 | 6.11 | 6.13 | 6.39 | 6.38 | 6.12 | 6.13 | |
10 × 10 | 7.33 | 7.25 | 7.23 | 7.27 | 7.33 | 7.16 | 7.23 | 7.26 | |
6MV | 3 × 3 | 4.39 | 4.75 | 4.57 | 4.46 | 4.39 | 4.72 | 4.52 | 4.47 |
5 × 5 | 6.51 | 6.51 | 6.34 | 6.34 | 6.51 | 6.49 | 6.33 | 6.31 | |
10 × 10 | 7.53 | 7.48 | 7.48 | 7.42 | 7.53 | 7.46 | 7.42 | 7.43 | |