Abstract: Purpose: The reason of imaging quality and wrong layer artifact of coronary arteries CTA with Dual-source CT and heart rate and to discuss the reason of poor imaging quality and the solution.Method: 70 cases of coronary arteries CTA imaging and ECG data of patients with suspected coronary artery disease from February 2010 to July 2010 were retrospectively analyzed.The difference of average heart rate,fluctuation of heart rate,variation of heart rate and average R-R period between the patients who has artifact and no artifact was compared.Results: Average heart rate,fluctuation of heart rate,variation of heart rate and average R-R period between the patients who has artifact and no artifact is no significant difference.Conclusion: Use in the double source CT in,average heart rate,heart rate motion,heart rate variation and average R-R expect to etc.parameter to isn't direct or mainly cause picture quality poor and wrong layer false shadow of main reason,this and double equipments function and data of the source CT collect a way relevant.Because the reason of picture false shadow is a heart Lyu not and together,the body in the scanning process move and appear false movie queen to carry on a heart electricity editor afresh detection and choose sport that is different to move period heart mutually same reconstruction time the window can rectify a wrong layer false shadow.