低管电压对双源CT冠状动脉成像图像质量和辐射剂量的影响

目的：分析低管电压双源CT冠状动脉成像（CTA）的图像质量,探讨低管电压扫描对减少冠状动脉CTA检查辐射剂量的价值。方法：150例患者分成两组行双源CT冠状动脉CTA检查,A组使用100kV管电压扫描,B组使用120kV管电压扫描。比较两组的辐射剂量,同时分析并比较两组冠状动脉的整体图像质量。结果：A、B两组的辐射剂量分别为（6.80±1.70）mSv和（13.01±2.61）mSv,A组辐射剂量明显小于B组,差异有统计学意义（t=17.168,P=0.000）。A、B两组冠状动脉图像质量评分分别为（2.87±0.25）分和（2.92±0.17）分,两组间差异无统计学意义（Z=-1.067,P=0.286）。结论：采用100kV管电压扫描行冠状动脉CTA检查能明显减小正常和略胖体型患者所接受的辐射剂量,同时图像质量不受影响。

The effect of low tube voltage on image quality and radiation dose with dual-source coronary CT angiography

Objective：To study the image quality of low tube voltage with dual-source coronary CT angiography （CTA） and to investigate the application of low tube voltage for reducing radiation dose.Methods：150 patients underwent dual-source coronary CTA were divided to group A and B with the tube voltage as 100kV and 120kV,respectively.The radiation dosage and image quality of coronary CTA between group A and group B were compared.Results：The effective radiation dose was （6.80±1.70）mSv for group A and （13.01±2.61）mSv for group B.The effective radiation dose for group A was obviously lesser than that for group B （t=17.168,P=0.000）.The image quality score of coronary artery for group A and B was 2.87±0.25 and 2.92±0.17,respectively.There was no statistic difference between these two groups （Z=-1.067,P=0.286）.Conclusion：Using the tube voltage as 100kV can obviously reduce the radiation dose for patients with normal or slight obese figure while with no influence on image quality.