Figure 2.

(a) Visual overview of lanthanum carbonate opacities. Axial CT images of lanthanum carbonate hydrate (Fosrenol chewable tablet) (window level 1500, window width −500) are shown, with a strong artifact due to a beam-hardening effect on the left, and on the right, with a window level of 15,000 and window width of 4000. (b) Beam-hardening artifacts on computed tomography images are also presented, caused by lanthanum carbonate hydrate in a patient on dialysis. Reprinted with permission from ref. [24]. Copyright 2010. Japanese Journal of Radiology.