A preliminary study on the diagnostic value of iterative model reconstruction technique combined with low-dose coronary CTA in patients with suspected coronary heart disease
LIU Xin, YANG Lin-lin, WANG Yi-jing, GAO Si-zhe, MA Yue, HOU Yang
Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, China
Abstract:Objective: To evaluate the image quality of low-dose coronary CTA combined with iterative model reconstruction(IMR) in coronary arteries and its diagnostic value for coronary stenosis in patients with suspected coronary heart disease. Methods: Eighty patients with suspected coronary heart disease who underwent coronary CTA and the catheter coronary angiography(CAG) in our hospital were analyzed retrospectively. The image quality of each coronary artery was divided into 4 grades. Coronary angiography showing coronary artery luminal diameter reduction>50% as positive standard, the sensitivity, specificity, positive predictive value(PPV), negative predictive value(NPV) and accuracy of coronary CTA in the diagnosis of coronary artery stenosis were analyzed at the level of coronary artery segment and main artery. Patients were divided into two groups according to the Agaston score(group A <400, group B≥400). The difference in diagnostic efficacy between the two groups was compared. Results: At the segment level, 98.1% of the coronary images were qualified, and the sensitivity, specificity, PPV, NPV and accuracy of CTA were 93.2%, 98.0%, 91.3%, 98.4% and 97.1% respectively. At the level of main artery, 96.6% of coronary images were qualified, and the sensitivity, specificity, PPV, NPV and accuracy of CTA were 84.6%, 93.0%, 88.9%, 90.1% and 89.6%, respectively. There were significant differences in specificity, PPV and accuracy between groups A and B(99.2% & 91.8%, 95.7% & 84.2%, 97.9% & 93.7%, P<0.05). Conclusions: Low-dose coronary CTA combined with IMR can obtain satisfactory image quality and has high diagnostic accuracy for coronary artery stenosis. However, the diagnosis of severely calcified segments is still limited.
刘 鑫,杨林林,王一婧,高思喆,马 跃,侯 阳. 应用全模型迭代重建技术的低剂量冠脉CTA在疑似冠心病患者中诊断价值的初步研究[J]. 中国临床医学影像杂志, 2020, 31(4): 252-257.
LIU Xin, YANG Lin-lin, WANG Yi-jing, GAO Si-zhe, MA Yue, HOU Yang. A preliminary study on the diagnostic value of iterative model reconstruction technique combined with low-dose coronary CTA in patients with suspected coronary heart disease. JOURNAL OF CHINA MEDICAL IMAGING, 2020, 31(4): 252-257.
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