Authors: Lei Tang XiaoPeng Zhang YingShi Sun YanLing Li XiaoTing Li Yong Cui ShunYu Gao
Publish Date: 2012/12/21
Volume: 35, Issue: 6, Pages: 539-545
Abstract
Gemstone spectral CT and conventionally polychromatic CT examinations were randomly allocated to be performed on 62 consecutive patients A total of 11 groups of monochromatic images were generated on energy levels ranging from 40 to 140 keV at an interval of 10 keV A fivescore classification system was used to evaluate the performances of CT images in the demonstration of GCL The interobserver agreement between two radiologists in their evaluation of the GCL by each method was evaluated using kappa statisticsThere were statistically significant differences between the spectral CT and polychromatic CT in their abilities to highlight the GCL observer 1 χ2 = 18310 P 0001 observer 2 χ2 = 19780 P 0001 The distinct display score ≥ 3 rates of the GCL by integrated monochromatic images were higher than that of polychromatic images P 0001 The best energy level for displaying the GCL by spectral CT was 50–70 keV The kappa value for the image scores on the integrated keV images between the two radiologists was higher than that for polychromatic CT images P 001
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