Table 3. Sensitivity analysis of the HU and molecular composition to ρ and ρ_e conversion process for kVCT using α_i values determined by method 2 (CT calibration phantom).

Assumed Pure Composition	Simulated 10% Error	Error in ρ (%)	Error in ρe (%)
Water	Lipid	-0.5	-0.6
Water	Protein	-0.6	-0.2
Lipid	Water	0.5	0.6
Lipid	Protein	-0.1	0.4
Protein	Water	0.6	0.2
Protein	Lipid	0.1	-0.4
Water	Minerals	5.7	6.8
Lipid	Minerals	6.5	7.6
Protein	Minerals	6.6	7.3
Minerals	Water	-3.9	-5.2
Minerals	Lipid	-4.3	-5.6
Minerals	Protein	-4.3	-5.1

Compositions of 100% pure molecules (as noted in the left most column) were assumed and errors were calculated by simulating a 10% error from a separate molecule type (2^nd column from the left).