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Table 2 HU and mass density ranges used in PRIMO and Acuros computations

From: MLC parameters from static fields to VMAT plans: an evaluation in a RT-dedicated MC environment (PRIMO)

MaterialPRIMO HU rangePRIMO mass density range (g/cm3)Acuros HU rangeAcuros mass density range (g/cm3)
Air− 1000, −  9570, 0.0204−1000, −  9570, 0.0204
Lung−957, −  4000.0204, 0.594−  967, −  3740.0104, 0.624
Adipose Tissue−  400, −  590.594, 0.969−  434, 10.551, 1.001
Muscle, Skeletal− 59, 880.969, 1.075−59, 1170.969, 1.093
Cartilage88, 2981.075, 1.19957, 9711.056, 1.600
Bone298, 28321.199, 2.833128, 28321.100, 2.830