CT后处理联合阴性对比剂在诊断大肠病变的临床价值评价

Clinical evaluation of CT post-processing jointed negative contrast agent in diagnosis of colorectal lesions

目的研究CT多种后处理方法联合阴性对比剂显示大肠病变的临床诊断价值。方法对54例患者小肠及大肠阴性对比剂充盈后进行CT容积扫描。在工作站行多平面重建(MPR)、CT仿真内镜(CTVE)、透明显示(Raysum)、曲面重建(CPR)等数据后处理,分析病变部位、直径、轮廓、密度及强化程度。结果 CT诊断大肠病变阳性40例、阴性14例,其中假阳性1例,假阴性3例,共误漏诊4例。CT检出大肠病变的灵敏度92.9%,特异度91.7%,准确率92.6%。结论 CT后处理联合阴性对比剂可以清楚显示大肠病变,对提高病变定性定位准确率帮助明显,可以提供临床直观依据。

Objective To investigate the value of CT post-processing combined with negative contrast agent in the diagnosis of colonic lesion. Methods 54 patients with colonic lesions underwent CT volume scans with negative contrast agent filling the small intestine and pneumocolon. Images were obtained by multi-planar reformation（MPR）, CT virtual endoscopy（CTVE）, volume rendering（VR） and Raysum on post-processing workstation. The location, size, shape, density, enhancement pattern were studied. Results Among 54 cases in CT diagnosis, 40 cases were positive and 14 cases were negative, 1 case was false positive and 3 cases were false negative, 4 cases were misdiagnosis. The sensitivity, specificity and accuracy were 92.9%, 91.7% and 92.6%, respectively. Conclusion Colonic lesion can be clearly showed by CT post-processing joint negative contrast agent, it obviously improves the accuracy of localization and qualitative diagnosis.