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Fig. 2 | BMC Urology

Fig. 2

From: Optimized management of urolithiasis by coloured stent-stone contrast using dual-energy computed tomography (DECT)

Fig. 2

a. Results acquired for various tube potentials (80/150 kVp; 90/150 kVp; 100/150 kVp). Respective Hounsfield units (HU) were measured and plotted. Stents above the cut-off of 1,15 appeared blue and samples below the cut-off appeared red. Reference values for known stone types are depicted as well. Polyurethane-based samples were blue, silicone-based stents were red. b. A pure calcium oxalate monohydrate stone of 2 mm (blue) was affixed to a blue and red stent on DECT. The enhanced stent-stone-contrast obtained for the red stent allows clear differentiation of the stone from the adjacent stent. For the blue stent a contour irregularity of the stent is indicative of stone presence, better displayed on coronal than sagittal images

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