摘要
Abstract
Objective To explore the diagnostic value of low-dose coronary CT angiography(CCTA)examination based on the technology of iterative model reconstruction(IMR)for coronary artery stenosis in coronary heart disease(CHD).Methods Seventy-eight patients suspected with CHD and coronary artery stenosis were selected.All patients underwent low-dose CCTA examination based on IMR technology.The image quality score of CCTA examination was analyzed,while the CT,contrast noise ratio(CNR)and standard deviation(SD)values of each coronary artery segment separately by using IMR,iDose4 and FBP algorithms were compared.Taking coronary angiography(CAG)diagnosis results as the gold standard,the diagnostic value of low-dose CCTA examination using IMR technology for coronary artery stenosis in CHD was analyzed,and its consistency with the diagnosis results of the gold standard was discussed.Results A total of 310 images of the main branches of coronary arteries were obtained in this examination,and 300 of them met the standard for the quality of coronary artery images.There were 10 images with a score of 1,11 images with 2 points,44 images with 3 points,and 235 images with 4 points.There was no statistically significant difference in CT values of each coronary artery segment by using different algorithms(P>0.05).The CNR values of each segment of coronary arteries obtained by low-dose CCTA examination based on IMR technology were all higher than those based on iDose4 and FBP,while the SD values of each segment of coronary arteries were all lower than those based on iDose4 and FBP,all with statistically significant differences(all P<0.05).Based on the calculation of coronary artery segments,there were 765 out of the obtained 780 segments in all,which met the diagnostic criteria for anomalous coronary artery.The diagnostic accuracy rate,sensitivity,specificity,and positive and negative predictive values of low-dose CCTA examination using IMR technology for coronary artery stenosis were 89.02%,92.48%,82.31%,91.03%and 84.92%,respectively.The consistency of this examination was good in the diagnosis of coronary artery stenosis(Kappa=0.753,P<0.05).Conclusion Low-dose CCTA scanning based on IMR technology could effectively detect coronary artery stenosis in CHD,with relatively high diagnostic accuracy rate and consistency.It provides effective references for clinical diagnosis of coronary artery stenosis in CHD,and is worthy of promotion and application.关键词
冠心病/全模型迭代重建/冠状动脉CT血管造影/冠状动脉造影/准确率Key words
coronary heart disease/iterative model reconstruction/coronary CT angiography/coronary angiography/accuracy rate分类
医药卫生
