RESUMEN
Objective To investigate the value of monochromatic curve features parameters in assessing various types of upper urinary calcium calculi in vivo on dual-energy CT(DECT).Methods Total 55 calcium calculi underwent dual-source CT in dual-energy mode were analyzed retrospectively.According to the result of infrared spectrometer,four types of calcium calculi were seen in this study:group 1(COM,12),group 2(COM+COD,9),group 3(COM+CaP,8),group 4(COM+COD+CaP,26).For each stone,mono-chromatic images from 40 keV to 190 keV(interval of 10 keV)were reconstructed.We used the different single spectral CT values and curve slope to differentiate of various types of calcium calculi.Results The parameters of the different single spectral CT values and curve slope were significantly different among the four groups.110 keV could differentiate the most groups.The curve slopes of group 1 with group 2 and group 3,group 2 with group 4,group 3 with group 4 were significantly different.Conclusion The spectral curve features parameters is helpful in the characterization of various types of calcium calculi.