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Attenuation coefficients (μm values; cm-1) as a function of (a) physical density and (b) effective atomic number in the RMI 467 phantom derived from the four investigated scanners (ο P-CT, ΔG-CT, ×S-CT, □T-CT, + theoretical value). Theoretical values are shown as μ values for the 140 keV photopeak, and the μm values for each scanner were converted via the measured effective energy of CT X-rays
