Table 1.

CT numbers extracted from real and simulated images of ACR phantom averaged across 4 measurements (4 dose levels).

		Bone	Acrylic	Water	Polyethylene	Air
25 keV	Real	873.0 ± 2.4	121.3 ± 0.2	−2e-9 ± 1e-7	−96.3 ± 0.5	−972.1 ± 1.8
	DukeSim	865.9 ± 0.6	126.3 ± 0.3	−4e-8 ± 9e-8	−90.5 ± 0.0	−999.9 ± 0.1
75 keV	Real	642.6 ± 1.8	140.0 ± 1.5	−1e-8 ± 2e-7	−71.3 ± 1.8	−978.3 ± 2.1
	DukeSim	631.7 ± 0.8	145.1 ± 0.5	−6e-8 ± 4e-8	−62.7 ± 0.5	−1001 ± 0.7
25–75 keV	Real	956.8 ± 1.3	115.3 ± 0.2	2e-8 ± −1e-7	−104.6 ± 0.4	−971.3 ± 1.5
	DukeSim	947.3 ± 0.9	121.0 ± 0.3	1e-8 ± 1e-7	−98.6 ± 0.1	−999.9 ± 0.1