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《Radiologic Practice》 2018-01
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A prospective study of dual-source dual-energy CT for determining major composition of urinary stones in vivo

ZHANG Gu-mu-yang;SHI Bing;XUE Hua-dan;Department of Radiology,Peking Union Medical College Hospital,Peking Union Medical College,Chinese Academy of Medical Sciences;  
Objective:To prospectively evaluate whether dual-source dual-energy CT(DSDECT)could accurately differentiate uric acid stones from non-uric acid stone and distinguish calcium oxalate stone from non-uric acid stone in vivo.Methods:81 urinary stones in 67 patients were included in this study.Reference standard of stone composition was made by Fourier transform infrared spectroscopy(FT-IR).Diagnostic performance of DSDECT for determining uric acid stone and calcium oxalate stone were evaluated.Results:According to the result demonstrated on DSDECT analysis,7 uric acid stones and 74 non-uric acid stones were found,among which,66 were calcium oxalate stone and 8 were non-calcium oxalate stone.The sensitivity,specificity,positive predictive value,negative predicted value and accuracy of DSDECT for differentiating uric acid stone and determining calcium oxalate stone among non-uric acid stones were 77.8%、100%、100%、97.3%、97.5% and 100%、80%、97.0%、100%、97.3%,respectively.Conclusions:DSDECT could accurately differentiate uric acid stone from non-uric acid stone and distinguish calcium oxalate stone from non-uric acid stone in vivo.
【CateGory Index】: R691.4;R816.7
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