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Summary of water HU accuracy and uniformity measured on corresponding the central slice, for different diameter cylinders, compared to ACR [12] and Hobson [16] recommendations
| Metric | ACR (CT) Recommendations | Hobson et al. (CBCT) Recommendations | Phantom Diameter (cm) | AZOR (HU) | saddle (HU) |
|---|---|---|---|---|---|
| HU Accuracy | ±7 HU | ±16 HU | 15 | 9 | −4 |
| 12.5 | 2 | −1 | |||
| 10 | 1 | 0 | |||
| HU Uniformity (Center to Edge) |
±5 HU | ±22 HU | 15 | ±26 | ±27 |
| 12.5 | ±19 | ±16 | |||
| 10 | ±13 | ±13 |
