Table 4 Flatness, symmetry and average penumbra for 10 × 10cm2 reference field measured at 90 cm SSD and 10 cm depth (reproduced with permission from MedEuropa)
LINAC | Beam type | Unflatness and Flatness (%) | Symmetry (%) | Average penumbra (mm) | |||
|---|---|---|---|---|---|---|---|
in-plane | cross-plane | in-plane | cross-plane | in-plane | cross-plane | ||
Linac 1 | 6MV | 103.9 | 104.66 | 100.39 | 100.44 | 6.43 | 7.9 |
6MV FFF | 1.142 | 1.153 | 100.43 | 100.9 | 6.33 | 7.57 | |
Linac 2 | 6MV | 103.9 | 104.6 | 100.38 | 100.24 | 6.44 | 7.88 |
6MV FFF | 1.142 | 1.151 | 100.27 | 100.49 | 6.34 | 7.59 | |
Linac 3 | 6MV | 103.82 | 104.62 | 100.51 | 100.49 | 6.45 | 7.77 |
6MV FFF | 1.147 | 1.153 | 100.58 | 100.16 | 6.35 | 7.64 | |