Study on Diagnostic Value of 64-slice Spiral CT Coronary Angiography in Coronary Artery Stenoses

Objective:To study the diagnostic value of 64-slice spiral CT coronary angiography in coronary artery stenoses.Methods:Fifty-three patients underwent both 64-slice spiral coronary angiography and conventional coronary angio-graphy (CCA).Conventional coronary angiography was taken as golden standard,using a 15-segment modified AHA classification,to evaluate the image quality of 745 available coronary segments of MSCT and the performance in detecting coronary artery lesions,to obtain the diagnostic accuracy of MSCT of significant lesions (a lumen restriction of ≥50%),and to analyze the impacts of coronary artery calcium on the diagnostic accuracy.Results:There were 587 coronary segments considered to have diagnostic image quality,but 158 segments could not be evaluated for motion artifacts (27 segments) and severe calcifications (131 segments).The sensitivity,specificity,positive predictive value and negative predictive value of MSCT in detecting lesions were 93.4%,97.9%,93.9% and 97.7%,respectively.When calciulm score was ≥1000,the sensitivity,specificity,positive predictive value and negative predictive value were 74%,82%,68%,96%,respectively.Conclusion:64-slice spiral CT coronary angiography is a fast,safe and noninvasive examination method,it has a fairly good identity with CCA in detecting coronary artery stenosis and should be the first choice of method for detecting suspected patients.