Table 3 Flatness and symmetry for 6MV beam field size 10 × 10cm2, measured at three different depth 5 cm, 10 and 20 cm. (reproduced with permission from MedEuropa)
Parameters | Depth (mm) | Ref. | Measured data | Deviation from reference (%) | ||||
|---|---|---|---|---|---|---|---|---|
Linac 1 | Linac 2 | Linac 3 | Linac 1 | Linac 2 | Linac 3 | |||
Flatness | 50 | 102.36 | 102.38 | 102.33 | 102.47 | 0.02 | -0.03 | 0.11 |
100 | 104.16 | 104.28 | 104.25 | 104.22 | 0.12 | 0.09 | 0.06 | |
200 | 105.91 | 106.10 | 105.93 | 106.06 | 0.17 | 0.02 | 0.14 | |
Symmetry | 50 | 100.00 | 100.36 | 100.26 | 100.53 | 0.36 | 0.26 | 0.53 |
100 | 100.00 | 100.42 | 100.31 | 100.50 | 0.42 | 0.31 | 0.50 | |
200 | 100.01 | 100.46 | 100.43 | 100.48 | 0.46 | 0.42 | 0.47 | |