CT number (Hounsfield unit) accuracy for the CereTom and the specific requirements in the ACR CT accreditation program
| Material | Measured (HU) | ACR CT Accreditation Requirements |
|---|---|---|
| Air | −990 | Between −1005 and −970 HU |
| Polyethylene | −106 | Between −107 and −87 HU |
| Water | −1.7 | Between −7 and +7 HU (±5 HU preferred) |
| Acrylic | 119 | Between 110 and 130 HU |
| Bone | 1060 | Between 850 and 970 HU |
Note:—HU indicates Hounsfield units.