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(Left) Relative root-mean-square error (rel. RMSE (%)) obtained from linear fittings between Tb.Sp from XtremeCT and CT (photon-counting: UHRnm and UHRdm, EI: energy integrating) as a function of the threshold setting used to binarize the CT volumes. (Right) rel.RMSE(%) obtained for different percentiles of the Tb.Sp distributions for the three CT protocols.
