The Application of ECG-gated Automatic mA Modulation Technique in the MSCT Cardiac Imaging
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摘要: 目的: 研究总结ECG门控自动毫安调制技术在MSCT冠状动脉成像中的应用价值,探讨心脏CT低剂量技术的初步经验和方法。方法: 患者60例,其中30例随机使用固定毫安扫描,另30例使用ECG门控自动毫安调制技术扫描。以64排螺旋CT行冠状动脉成像,扫描前进行心率控制措施,使用后门控数据采集、容积再现(VR)、最大密度投影(MIP)、曲面重建(CPR);以MIP图像评价冠状动脉管腔;以VR图像5级记分法评价图像质量。结果: 60例患者均成功获得冠状动脉影像。自动毫安组较固定毫安组平均剂量降低10.46%,而图像质量两组一致,无统计学差异。ECG门控自动毫安技术在保证图像质量的前提下能有效降低患者平均辐射剂量。结论: ECG门控自动毫安技术能有效降低患者射线剂量,只要准备措施有效及方法得当,就能够用低剂量完成64排MSCT冠状动脉检查,并可获得较满意的效果。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.
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Keywords:
- 64-MSCT /
- cardiac visualization /
- ECG-gated automatic mA /
- X-ray low dose
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