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Effect of image registration errors on D50 and γ50 values.
| Target | 1 | 2 | 3 |
|---|---|---|---|
| Reference D50 | 52.12 | 51.67 | 42.10 |
| D50 error max | 0.9% | 4.4% | 2.7% |
| Reference γ50 | 12.31 | 6.99 | 10.7 |
| γ50 error max | 10% | 180% | 12% |
Effect of imposing a ± 3 mm registration error in each superior-inferior, left–right and anterior–posterior direction on the dose response parameters: D50 and γ50. The D50 is robust to registration errors up to 3 mm in any direction, while γ50 is very sensitive to such error.
