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Table 1 Phantom inserts.

From: Investigation of the usability of conebeam CT data sets for dose calculation

Material   specified density (g/cm3) HU-DpCT density (g/cm3) HU-DpCT CT value (HU)
Air   0 0 0
PMP C6H12(CH2) 0.83 0.81 800
LDPE C2H4 0.92 0.91 900
Polystyrene C8H8 1.05 0.96 960
Acrylic C5H8O2 1.18 1.12 1120
Delrin® proprietary 1.41 1.27 1340
Teflon® CF2 2.16 1.61 1950
  1. CATPhan® material inserts and their specified density values are listed; for comparison the measured CT values in the planning CT and the corresponding density determined from the Gammex RMI® table HU-DpCT.