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Image quality consistency thresholds for the Medium (M20) CBCT
| Warning (%) | Action (%) | |
|---|---|---|
| High contrast spatial resolution(lp/mm) | ||
| f30 | 9 | 18 |
| f40 | 4 | 9 |
| f50 | 4 | 8 |
| HU constancy | ||
| Lung(PMP) | 2 | 4 |
| Water(Poly) | 2 | 4 |
| Air | 1 | 3 |
| Uniformity | ||
| Mean | 1 | 3 |
| Sigma | 3 | 6 |
| Noise | ||
| Mean | 1 | 3 |
| Sigma | 4 | 8 |
Sample size of 30 measurements.
