Figure 10: Determination of the best combination of dilution rate and monoenergetic energy using VMI. The combinations that maintained enhancement above 300 HU were 10:0 at 65 kV, 4:6 at 40 keV, 5:5 at 45 keV, 6:4 at 55 keV, 7:3 at 60 keV, 8:2 at 60 keV, and 9:1 at 65 keV. In addition, the dilution ratio of 6:4 at 55 keV only provided an enhancement level of 300 HU for 5 s, which corroborates the TEC using single-energy scanning at 100 kV.