双源CT双能量肺灌注成像对肺动脉栓塞的诊断价值

目的评估双源CT双能量肺灌注成像(DEPI)对肺动脉栓塞的诊断价值。方法回顾性分析2017年8月至2018年7月在嘉兴市第二医院收治的临床诊断疑似肺动脉栓塞成功行DEPI检查的87例患者的临床资料,以CT肺动脉造影(CTPA)诊断结果为参照标准,分别以患者和肺叶为评价单位,采用诊断性试验计算DEPI对肺动脉栓塞检出的诊断符合率、灵敏度、特异度、阳性预测值、阴性预测值、Youden指数、阳性似然比、阴性似然比,并计算Kappa系数值,评价DEPI与CTPA诊断结果的一致性。结果分别以患者和肺叶为评价单位,DEPI对肺动脉栓塞检出的诊断符合率分别为85.06%和89.57%,灵敏度为88.41%和76.80%,特异度为72.22%和96.82%,阳性预测值为92.42%和93.20%,阴性预测值为61.90%和88.02%,Youden指数为0.61和0.74,阳性似然比为3.18和24.15,阴性似然比为0.16和0.24,DEPI与CTPA诊断结果分别具有较好和极好的一致性(Kappa值为0.571和0.765)。结论 DEPI对于肺动脉栓塞的检出具有较高的准确率、敏感度和特异度,将D...

Diagnostic Value of the Dual Source CT Dual Energy Pulmonary Perfusion Imaging for Pulmonary Embolism

Objective To assess the diagnostic value of dual energy pulmonary perfusion imaging(DEPI)for pulmonary embolism.Methods The clinical data of 87 patients with suspected pulmonary embolism who had received DEPI between August 2017 and July 2018 in Jiaxing Second Hospital were retrospectively analyzed.With the findings of CT pulmonary angiography(CTPA)as the reference standard and with patients and pulmonary lobes as evaluation units,respectively,a diagnostic test was performed to calculate the diagnostic coincidence rate,sensitivity,specificity,positive predictive value,negative predictive value,Youden index,positive likelihood ratio,negative likelihood ratio,and Kappa coefficient value for the diagnosis of DEPI and CTPA.Results The coincidence rate,sensitivity,specificity,positive predictive value,negative predictive value,Youden index,positive likelihood ratio,and negative likelihood ratio were 85.06%,88.41%,72.22%,92.42%,61.90%,0.61,3.18,and 0.16,respectively,when applying the patients as evaluation units.When the pulmonary lobes were invoked as evaluation units,the above-mentioned indexes were 89.57%,76.80%,96.82%,93.20%,88.02%,0.74,24.15,and 0.24,respectively.The diagnostic results of DEPI and CTPA had a good and excellent consistency,respectively(Kappa value=0.571,0.765).Conclusions DEPI has high accuracy,sensitivity,and specificity in the detection of pulmonary embolism.The combination of DEPI with CTPA can simultaneously obtain the anatomical structure and functional information images,greatly improving the diagnostic accuracy for pulmonary embolism.Thus,it can be used as the preferred examination for patients with clinically suspected pulmonary embolism.