Abstract：Objective To explore the clinical value of comparing calcium oxalate stones with mixed calcium stones based on dual-source CT.Methods The clinical data of 120 patients with upper urinary calculi from January 2018 to June 2019 were retrospectively analyzed. According to the results of in vitro infrared spectrum analysis of calculi, 42 cases were divided into the calcium oxalate group and 78 cases were divided into the calcium oxalate group.All patients underwent preoperative dual-source CT examination, and the dual-source CT multi-parameters of calculi in the two groups were obtained and compared.Results The double energy ratio, double energy index and atomic number in the calcium oxalate group were lower than those in the mixed calcium stone group,while the double energy difference and slope were higher than those in the calcium stone group. There were statistically significant differences in stone dualenergy ratio,dualenergy index, energy spectrum curve slope and atomic number between the two groups（P<0.05）.The comparison of different single energy CT values of stones in the two groups showed statistically significant differences(P<0.05).The dualenergy ratio was the best for the identification of calcium oxalate stone and mixed calcium stone,and the dualenergy index, atomic number and energy spectrum curve slope were also different from them, with the specificity of 72.2% and the sensitivity of 91.8%.Conclusions Preoperative dual-source CT examination of patients with upper urinary calculi is helpful to identify different types of calcium calculi through multi-parameter CT examination, which is helpful to provide important value for individual treatment of urinary calculi by clinicians.
