Table 1.
Measured beam response dependence on ROI size
| EPID position (mm) | Beam response | % deviation | ||
|---|---|---|---|---|
| Lateral | Longitudinal | 7 × 7 ROI | 45 × 45 ROI | |
| 0 | 100 | 1.077 | 1.075 | 0.19 |
| 0 | −100 | 1.082 | 1.080 | 0.19 |
| 100 | 0 | 1.079 | 1.078 | 0.09 |
| −100 | 0 | 1.075 | 1.074 | 0.09 |
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