64 Row Spiral Ct Coronary Artery Imaging Prospective And Retrospective Heart Switch Control Image Quality And Radiation Dose

Research purposesCompare64-slice spiral CT coronary angiography with retrospective ECG gating with forward-looking ECG-controlled scanning image quality and radiation dose.Materials and MethodsSixty patients in our hospital with suspected coronary artery disease patients were selected, And the subjects were randomly divided into (A\B) two groups:Experimental group (A)30patients (heart rate≤65times/min, The average body mass index was25.32±3.16kg/m2) Prospectively ECG-gated scans, Tube voltage120KV, tube current700mA;30cases of the control group (B) heart rate≤65beats/min, the average BMI25.43±3.12kg/m2, Line retrospective ECG-gated scans, the tube voltage120KV, tube current800mA, respectively calculate the mean effective dose (ED) accepted by the two groups of subjects; Standardized radiation dose (ED standard)120mm as standard scan length were calculated and statistical t-test analysis. The same time, the two groups of patients with coronary artery segment display quality score, using the chi-square test.ResultStudy randomized prospective ECG gating with retrospective ECG-gated coronary imaging, the average ED accepted by the two groups of subjects, respectively, for the from5.99±2.45mSv and27.35±4.38mSv scanning standardized length120mmED standard for from5.48±2.42mSv and22.79±5.08mSv, respectively. The two groups of subjects average ED and ED standard differences were statistically significant (P＜0.001), experimental group of prospective ECG-gated ED standard a decrease of75.5%as compared with the control group retrospectively ECG control. The image quality of the two groups of coronary imaging was no significant difference (X2=4.37, P=0.232).Conclusion1heart rate, heart rate≤65beats/min, law Qi cases, compared with retrospective ECG gating prospective gated coronary angiography no difference in image quality.2.Heart rate, heart rate≤65beats/min, law Qi cases, compared with retrospective ECG gating prospective gated coronary imaging can significantly reduce the effective radiation dose.