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. 2022 Jan 4;40(6):547–559. doi: 10.1007/s11604-021-01233-2

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© The Author(s) 2021

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Fig. 8 — Virtual monochromatic images obtained at 40 (a), 70 (b), and 140 keV (c) (window level/width; 30/580 HU). On dual-energy CT scans, a monochromatic image, looking as if it had been acquired with single energy (keV), can be synthesized arbitrarily. The CT attenuation number on approximately 65–70 keV virtual monochromatic images is equivalent to single-energy CT scans acquired at 120 kV. The iodine contrast increases as the energy level decreases