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Dose-normalized contrast-to-noise ratio (CNRD) of iodine maps (colored solid lines) and noise quotient (RelNoise = σLow/σHigh, dashed lines) for all phantoms sizes, all tube voltages, and all thresholds. Colors encode phantom sizes, i.e., the S-phantom (green), the M-phantom (blue), and the L-phantom (red). Black dashed-dotted lines were acquired using the M-phantom in a reference dual-source dual-energy CT system
