ECG电流调控模式在256层螺旋CT冠脉成像中的应用  

The application of 256-slice CT coronary angiography with ECG-controlled tube current modulation

作　　者：郭铁刚[1] 田新华[2] 弓婷婷[2] 杨哲[2] 李思慧[2] 李波[2] 

机构地区：[1]北京理工大学社区卫生服务中心(北京理工大学医院)放射科,北京100081 [2]吉林大学第二医院放射线科

出　　处：《中国实验诊断学》2011年第3期465-468,共4页Chinese Journal of Laboratory Diagnosis

摘　　要：目的比较256层螺旋CT冠脉成像中ECG电流调控模式及回顾性心电门控扫描的图像质量和病人的辐射剂量。方法对62例怀疑冠心病患者进行256层螺旋CT冠状动脉造影,患者随机分成两组,A组采用回顾性心电门控扫描成像,B组采用ECG电流调控模式成像,对两组患者的图像质量进行主观及客观评价,客观评价包括信号噪声比及对比度噪声比,同时对患者的辐射剂量进行比较。结果 A组及B组的图像信号噪声比分为(14.41±1.05)和(15.07±3.29),差异无统计学意义(t=-1.07,P=0.29)。两组图像对比度噪声比分别为(12.03±0.98)和(12.64±3.02),差异无统计学意义(t=-1.08,P=0.28)。A组及B组的有效剂量分别为(10.77±0.96)mSv和(8.59±2.50)mSv,差异有统计学意义(t=4.59,P<0.001)。结论 256层螺旋CT冠状动脉造影中,与回顾性心电门控扫描比较,ECG电流调控模式在没有降低图像质量的情况下,射线剂量降低约20.2%,病变检出的准确率达95.7%。Objective Compare image quality and radiation dose for 256-slice computed tomography（CT） coronary angiography obtained with retrospective ECG gating and ECG-controlled tube current modulation.Methods 256-slice computed tomography（CT） coronary angiography was performed in 62 patients who doubted coronary atherosclerotic disease.Patients were divided into two groups,group A was performed with the retrospective ECG gating modulation,and group B was performed with the ECG-controlled tube current modulation.Compare the image quality and radiation dose between two groups.Results The mean image SNR was（14.41±1.05） and（15.07±3.29） for group A and group B respectively,there was no significant difference（P=0.29）.The mean image CNR was（12.03±0.98） and（12.64±3.02） for group A and group B respectively,there was no significant difference（P=0.28）.The average effective dose（ED） was（10.77±0.96） mSv and（8.59±2.50） mSv for group A and group B respectively,there was significant difference（P0.001）.Conclusion 256-slice CT coronary angiography with ECG-controlled tube current modulation can reduce radiation dose about 20.2%,while maintaining image quality compared with retrospectively ECG gating modulation,the diagnostic accuracy is 95.7%.

关 键 词：体层摄影术 CT ECG电流调控 

分 类 号：R816.2[医药卫生—放射医学]