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. 2016 Summer;4(2):81–89. doi: 10.7508/aojnmb.2016.02.004

Figure 2.

Figure 2

Mean CT number (HU) as a function of (a) physical density and (b) effective atomic number in the RMI 467 phantom at different effective CT X-ray energies (Δ47 keV, □53 keV, ο 58 keV, ×64 keV). Regions of interest (ROIs) were set on the rod regions in CT images, and the mean CT numbers were calculated