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Objective To evaluate the image quality and radiation of fast kVp switching dual energy CT in split-bolus 2-phase CT urography (CTU).Methods Sixty-eight consecutive patients with hematuria were recruited in this study.Group A (n=34): By intravenous administering contrast agent in two boluses (35 ml and 60 ml)separated by 10-15 minutes delay,a combined nephrographic-excretory phase was achieved in a single scan.And the images were acquired with Gemstone Spectral Imaging mode (GSI) on fast kVp switching dual energy CT.