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ROC curve for PCAT attenuation derived from SDCT for differentiating high-risk plaques and non-high-risk plaques. ROC, receiver operator characteristic; CTpoly, PCAT attenuation assessed by polychromatic imaging; CT40 keV, PCAT attenuation assessed by virtual mono-energetic imaging (40 keV); PCAT, pericoronary adipose tissue; Zeff, effective atomic number; λHU, the slope of the spectral attenuation curve.
