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Objective To show the improved diagnostic image quality of dual-energy myocardial scan mode compared with coronary CTA scan mode with Dual-Source CT.Methods 100 patients who underwent coronary artery evaluation with Dual-Source CT were analyzed at our hospital between February2009 and July 2009.20 with dual-energy myocardial scan mode and 80 with coronary CTA scan mode.The heart rate of all patients were less than 70bpm.The original data was transmitted to the workstation to accomplish MIP, VR, and Circulation.Examination reports were analyzed for the presence of image quality,artifacts, and radiation dose between two kinds of scan methods.Results The number of examinations with the high-quality images was no significant difference between dual-energy myocardial scan mode and coronary CTA scan mode (p>0.05).The number of examinations with motion artifact was significantly higher with dual-energy myocardial than with coronary CTA (10% vs 6.25%; p < 0.05) ,especially to show the right coronary artery.The number of examinations with the average radiation dose was significantly lower with dual-energy myocardial than with coronary CTA (46.23±18.51 vs 70.57±22.73; p =0.01).Conclusion Dual-energy myocardial scan mode can provide high-quality images of coronary CT, and was similar to coronary CTA.But it can reduce the radiation dose, and obtain more data (assessment of myocardial).