| Position shift error (mm) | Gamma passing rate (%) | ||
| H & N | Prostate | ||
| X-axis | 1.0 | 97.4 ± 1.5 | 99.4 ± 0.4 |
| 2.0 | 95.1 ± 2.1 | 98.6 ± 0.5 | |
| 3.0 | 83.3 ± 4.6 | 96.7 ± 0.9 | |
| 4.0 | 66.8 ± 7.8 | 92.0 ± 1.2 | |
| X-axis | −1.0 | 98.2 ± 1.4 | 99.5 ± 0.5 |
| −2.0 | 95.5 ± 2.7 | 99.2 ± 0.7 | |
| −3.0 | 89.3 ± 5.2 | 98.1 ± 1.1 | |
| −4.0 | 72.2 ± 7.1 | 93.5 ± 1.3 | |
| Y-axis | 1.0 | 98.6 ± 1.2 | 99.7 ± 0.2 |
| 2.0 | 97.9 ± 1.5 | 99.0 ± 0.8 | |
| 3.0 | 95.8 ± 1.7 | 97.6 ± 0.9 | |
| 4.0 | 88.0 ± 2.5 | 92.8 ± 2.1 | |
| Y-axis | −1.0 | 98.2 ± 1.4 | 99.7 ± 0.2 |
| −2.0 | 96.9 ± 2.1 | 99.4 ± 0.4 | |
| −3.0 | 93.9 ± 3.1 | 98.1 ± 0.9 | |
| −4.0 | 85.7 ± 4.2 | 94.1 ± 2.4 | |