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Table 2: 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.

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