Abstract: Objective: To research and summarize the application value of the ECG-gated automatic mA modulation technique in the cardiac visualization,and to investigate the initial experience and methods of the low dose using the process of 64-MSCT cardiac imaging.Methods: Sixty patients devided into two groups randomly,thirty patients who underwent the examination of MSCT cardiac imaging with fixed-ma,the other patients with ECG-gated automatic-ma technique.To control heart rate(HR)before examination,and underwent the post-processing with volume rendering(VR),maximum intensity projection(MIP),multiplanar reconstruction(MPR).Evaluated the cardiac vessel with the MIP imaging,and recorded the quality of imaging using the 5 grades.Results: Acquired cardiac imaging of all patients successfully.Compared to the group of the using fixed-ma,the group of using ECG automatic-ma reduced average dosage 10.46%,and two groups had identical imaging quality.There was not significant difference between them.Conclusion: With the precondition of available measure and expedient method,ECG-gated automatic-ma modulation technique could reduce the dosage in the processing of 64-MSCT cardiac imaging effectively,and acquired high-quality imagines.