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Table 1 – HU and mass density ranges used in PRIMO and Acuros computations

From: Evaluation of target dose inhomogeneity in breast cancer treatment due to tissue elemental differences

  PRIMO HU range PRIMO mass density range (g/cm3) Acuros HU range Acuros mass density range (g/cm3)
Air − 1000, − 957 0, 0.0204 −1000, − 957 0, 0.0204
Lung −957, − 400 0.0204, 0.594 − 967, − 374 0.0104, 0.624
Adipose − 400, − 59 0.594, 0.969 − 434, 1 0.551, 1.001
Muscle − 59, 88 0.969, 1.075 −59, 117 0.969, 1.093
Cartilage 88, 298 1.075, 1.199 57, 971 1.056, 1.600
Cortical bone 298, 2832 1.199, 2.833 128, 2832 1.100, 2.830