The Study Of Image Quality And Diagnostic Accuracy About Low Dose Coronary Angiography Using The Third-Generation Dual-Source CT With Free Breathing And Heart Rate

Objective To prospectively investigate the diagnostic accuracy,image quality and radiation doses of prospectively ECG-triggered high-pitch acquisition(Turbo Flash)coronary computed tomography angiography(CCTA)using the third-generation dual-source CT compared with catheter coronary angiography(CAG)for the diagnosis of significant coronary stenoses.Methods Seventy patients underwent both CCTA and CAG.CCTA was performed with the third-generation dual-source CT system permitting data acquisition at an high-pitch of 3.2.CAG served as the standard of reference.radiation dose values were calculated using the dose-length product.Results(1)Image quality : there were no non-diagnostic image quality in right coronary atery and left anterior descending artery.The rate of coronary segments with non-diagnostic image quality was 0.91% in left circumflex artery.(2)Diagnostic accuracy : the sensitivity,specificity and positive and negative predictive values were 97%(289/298),98.3%(706/718),96%(289/301),98.7%(706/715)for segments assessment and 97.5%(159/163),85.1%(40/47),95.8%(159/166),90.9%(40/44)。for vessel assessment and 100% per patient.(3)Radition does : the effective radiation dose was on average(1.17 ± 0.29)m Sv.Conclusion CCTA using the prospectively ECG-triggered high-pitch mode(Turbo Flash)of the third-generation dual-source CT system is associated with high diagnostic accuracy for the assessment of coronary artery stenoses at low doses.