Study on effect and influence factors of the coronary artery imaging by 64-slice spiral CT

Abstract

Objective To study the various factors that influence image quality of 64-slice spiral CT coronary artery imaging, their impact extent and the assessment effect of coronary artery stonnsis. Methods Through examination of 838 clinical coronary heart disease suspect patients, by 64-slice spiral CT coronary artery imaging, in which, 218 patients were also examined by conventional coronary angiagraphy in a week, we took the conventional coronary angiography as the standard, analyzed the 64-slice spiral CT coronary artery imaging in the assessment of coronary artery stenosis by sensitivity, accuracy, positive predictive value and negative predictive value. Results The factors which affect the image quality of 64-slice spiral CT coronary artery imaging include heart rate, heart rate change range, delay time setting, β-blocker, respiratory rate, breath-holding or not, total amount of contrast medium and the speed of injection, image reconstruction phase, coronary artery calcification, the scan parameters, age and sex of patients, machine hardware and software performance and so on. The accuracy of the 64-slice spiral CT coronary artery imaging assessment of coronary artery stenasis was 95.9 % while the predictive values were 92.3%, 90.0% for positive and negative, respectively. Conclusion The influential factors are introduced as well as the methods that wig reduce or eliminate these factors. In the application of assessing coronary artery stonnsis, 64-slice spiral CT coronary artery imaging can basically meet the clinical requirements. Key words: 64 slice spiral CT ; Coronary artery imaging ; Quality control ; Coronary angiography ; Coronary artery stenosis ;