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| Material | Original grey level | Calculated HU | Actual HU | Percentage difference |
| Aluminium | 1384.5 | 2227.8 | 2212.7 | 0.76 |
| Outer bone equivalent | 825.4 | 1459.7 | 1428.0 | 1.61 |
| Inner bone equivalent | 35.3 | 247.3 | 246.8 | 1.83 |
| PMMA | −81.0 | 87.4 | 115.6 | 1.41 |
| Water equivalent | −101.1 | 56.2 | 17.0 | 2.62 |
PMMA, polymethlymethacrylate.
Mean keV, 73.4; Planmeca ProMax 3D, Planmeca, Helsinki, Finland.
