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(a) and (d) show uncorrected 120 kVp images of the titanium and Cerrobend phantom configurations, respectively, while (b) and (e) show the same image slice using mars 140 keV imaging, illustrating the artificial introduction of a low-density pocket within the titanium insert in (b). (c) and (f) show the density assignment along the central (vertical) axis using both imaging methods, along with the true density.
