Table 4.
Comparison of 3σ values based on 202 sets of measurements with tolerance threshold from published literature
| Daily QA tests | 3σ based on control charts | Threshold from published literature |
|---|---|---|
| Dose output | ±0.7% | ±1%8, ±2%5, 6, 9, ±3%4 |
| Field homogeneity | ±0.5% | ±2%9 |
| Distal range | ±0.3 mm | ±0.5 mm8, ±1 mm4, 5, ±2 mm6, 7, 9 |
| Proximal range | ±0.3 mm | ±2 mm9 |
| Width | ±0.2 mm | Not available |
| Distal‐fall‐off (mm) | 0 mm for E106 | Not available |
| ±0.1 mm for E145, E172 & E221 | ||
| Beam coincidence X | ±0.7 mm | ±1.5 mm5, ±2 mm9 |
| Beam coincidence Y | ±0.5 mm | |
| Spot position X | ±0.6 mm | ±1 mm7, ±1.5 mm5, 8, ±2 mm6, 9 |
| Spot position Y | ±0.4 mm | |
| In‐air spot sigma X | ±0.9% for E106 | ±10%5, 9, ±15%7 |
| ±1.7% for E145 | ||
| ±1.9% for E172 | ||
| ±2.1% for E221 | ||
| In‐air spot sigma Y | ±1.1% for E106 | |
| ±2.0% for E145 | ||
| ±2.7% for E172 | ||
| ±3.6% for E221 | ||
| Skewness X | ±0.2 for E106 | Not available |
| ±0.3 for E145, E172 & E221 | ||
| Skewness Y | ±0.2 for E106 & E145 | |
| ±0.3 for E172 & E221 | ||
| PPS translational | ±0.8 mm for lateral (X) | ±1 mm4, 5, 8, 9 |
| ±0.6 mm for longitudinal (Y) and vertical (Z) | ||
| PPS rotational | ±0.3° for pitch and roll | Not available |
| ±0.2° for yaw |