64层螺旋CT低剂量冠状动脉血管成像方案探讨

目的 评价64层螺旋CT低剂量冠状动脉血管成像的价值.方法 2009年1-6月157例患者随机分为3组,常规剂量组(A组)管电流量采用1000 mAs,两个低剂量组(B、C组)分别采用800、600 mis.对3组的图像质量、噪声、CT剂量指数(CTDI)、剂量长度乘积(DLP)和有效剂量(ED)进行评估.结果 A、B...

Assessment of Low-Dose Radiation in Coronary Artery Imaging by 64-Slices Multi-detector CT

Objective To evaluate the best tube current for low-dose radiation CT in coronary artery imaging by 64-slices multi-detector CT.Methods From January to June 2009,a total of 157 consecutive patients were randomly divided into 3 groups： group A（conventional group）： 1 000 mAs;group B： 800 mAs;group C： 600 mAs.The image quality,noise,CT dose index（CTDI）,dose length product（DLP） and effective dose（ED） in each group were measured and compared respectively.Results The image noise scores in group A,B,and C were（20.50±3.23）,（23.02±3.05） and（26.28±2.58）,respectively.There was no statistically significant difference among the three groups in the two indexes（P〉0.05）.The CTDI in group A,B and C were（58.7±0.23）,（46.98±2.27）,and（35.28±3.56） mGy,respectively;the DLP in each were（1 050.88±89.63）,（846.21±57.86）,and（641.13±32.15） mGy·cm,respectively;the Ed were（14.78±2.56）,（11.85±1.87）,and（8.98±1.15） mSv,respectively.All of the differences among the three groups in CTDI,DLP and ED were statistically significant（P〈0.05）.Conclusion The image with 600 mAs as tube current in the coronary artery imaging of 64-slices multi-detector CT could fulfill the need of the diagnosis,and the radiation dose is apparently lower than the conventional scan.