The Study Of Energy Spectrum CT In Displaying Obstructive Jaundice

Objective:The aim of this article is to evaluate the image quality and thediagnostic accuracy of obstructive jaundice by dual-energy gemstone spectralimaging(GSI) compared with conventional polychromatic images(QC),and analyzethe different lesions with the function of substance analysis.Materials and methods:30patients who suffered obstructive jaundicewere scanned with GSI mode HDCT.The optimal contrast-to-noise ratio for nidus wasselected by spectrum analysis.Two methods including a subjective method and anobjective method by two radiologists were used to compared the image quality of themono images at the best monochromatic level and the QC images.Obtained thenumber of correct diagnosis and the different spectrum images of the lesions, such asthe spectrum scatter diagram and base material images and then obtained thequantitative information.Results： The image quality in GSI images was superior to QC images(p <0.05)in the subjective method.In the objective method,the nidus was displayed moreclearly and the beam-hardening artifacts were reduced markedly(p <0.05).And therewas no significant difference between the two radiologists in scores,with goodcorrelation(Kappa=0.672). The diagnostic accuracy of the GSI images (93.33%) ishigher than the QC images (86.67%).Different lesions has different spectrum curve,different scattered point diagram,and the quantitative information can be measuredusing GSI viewer.Conclusion：A,The images within the optimal keV has lowest noise and best image quality.B，The energy spectrum CT can provide valuable informations toclinic about the lesions.