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Fig. 1C. —Low-dose unenhanced multidetector CT scans obtained with 4 x 2.5 mm collimation at 120 kVp in 45-year-old man (body mass index, 41.7 kg/m²) with acute left flank pain. Axial image obtained at 60 mAs, reconstructed at same level as A, was acquired because reviewers were unable to interpret image obtained at 30 mAs (B) and asked for images obtained at 60 mAs. Ureteral calcification (arrow) close to left ureteropelvic junction was identified by all reviewers.

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