基于64排螺旋CT对低剂量冠状动脉成像的研究  

Research of dose reduction techniques in coronary artery CT angiography with Multi Slice Spiral CT

作　　者：周嫒捷[1] 杨燕[1] 何志明[1] 孟娴[1] 

机构地区：[1]云南省中医医院放射科,云南昆明650021

出　　处：《影像研究与医学应用》2017年第6期18-19,共2页Journal of Imaging Research and Medical Applications

摘　　要：目的:在多排螺旋CT冠状动脉检查中,应用以体重指数(BMI)为基础的低剂量扫描方案前后图像质量及有效剂量变化的研究。方法:选取我院2016年5月到2017年5月期间80例临床拟诊为冠心病患者行冠状动脉CT造影检查,随机分成两组,40例为A组(常规剂量组),40例为B组(低剂量组),根据患者的体重指数BMI依次选择管电压(kV)及管电流(mA),并对两组图像质量进行比较评分,比较两组图像的信噪比、容积CT剂量指数(CTDInovl)及有效辐射剂量(ED)。结果:A组患者接受的有效辐射剂量为(18±1.14)mSv,B组患者接受的有效辐射剂量为(6.8±1.72)mSv,B组的辐射剂量明显低于A组(P<0.05)。A组和B组图像质量评分分别为(3.61±0.52)和(3.56±0.54),信噪比(SNR)分别为(27.51±4.41)和(27.30±4.23),两组间无显著差异(P>0.05)。结论:低剂量扫描方案明显降低了患者接受的扫描辐射剂量,并且并不影响图像质量及诊断。Objective To evaluate changes on image quality and effective radiation with the dose reduction protocol adapted by body mass index （BMI） in coronary artery angiography with Multi Slice Spiral CT. Methods Eight consecutive patients who are suspected with coronary artery disease （CAD） , forty were enrolled in Group A （Conventional group） , and another forty were enrolled in Group B （Dose reduction group） . The tube voltage and tube current modulation were chose depending on the BMI. The scores of image quality, signal noise ratio （SNR） , volume CT dose index （CTDIvol） , and effective dose （ED） were compared and evaluated. Results The mean effective dose in group A and group B was 40roSy and 6.SmSv.The ED in group B were lower than those in group A （P 〈 0.05） .The mean scores of image quality was （3.61±0.52） and （3.56±0.54） ,and the signal noise ratio （SNR） in group A and Group B was （27.51±4.41） g and （27.30±4.23） .There was no significant difference in the image quality scores and the signal noise ratio between the two groups （P 〉 0.05） .Conclusions Dose reduction protocol in coronary artery CT angiography could not only reduce the radiation dose of the patients, but also dose not affect the image quality and meet the dcmand of the diagnosis.

关 键 词：体层摄影术 X线计算机 低剂量 冠状动脉成像 有效剂量 

分 类 号：R445[医药卫生—影像医学与核医学]