64排螺旋CT轴位节段扫描技术在降低腹部CT检查辐射剂量的应用  

Application of cine segment technique in 64-slice spiral CT to reduce radiation dose in abdominal CT examination

作　　者：张辉阳[1] 周智鹏[1] 邱维加[1] 曾阳东[1] 陈德勤[1] 

机构地区：[1]桂林医学院附属医院放射科,广西桂林541001

出　　处：《华夏医学》2013年第1期47-50,共4页Acta Medicinae Sinica

基　　金：广西卫生厅自筹经费科研课题基金资助(Z2012410)

摘　　要：目的:研究轴位节段扫描降低腹部CT检查X线辐射剂量的价值。方法:38例腹部CT扫描患者,按就诊顺序随机分成两组。A组螺旋扫描20例,采用120kV,自动毫安,噪声指数(Noise Index,NI)=8扫描;B组轴位节段(Cine Segment)扫描18例,采用120kV,自动毫安,NI=8。分别进行平扫和增强扫描,比较各组图像质量、噪声水平和平均辐射剂量。结果:各组图像平扫、动脉期和静脉期图像得分之间的差别无统计学意义(P>0.05)。平扫两组图像噪声无统计学差异(P>0.05),增强后A组和B组图像噪声之间有明显统计学意义(P<0.01)。X线辐射剂量B组比A组降低约47%,差异有明显统计学意义(P<0.01)。结论:轴位节段扫描在保证图像质量的同时,有效降低了腹部CT扫描的辐射剂量。Objective. To evaluate the value of cine segment technique to reducing radiation dose in abdominal CT examination. Materials and Methods. 38 patients performed abdominal CT scans were randomly divided into two groups according to the order of visiting the doctors. 20 patients in Group A underwent examination of spiral scans with 120 kV, Smart-mA and Noise Index= 8; while in group B, 18 patients underwent examination by cine segment scan with 120 kV, Smart-mA, Noise Index=8. Patients in both group received plain scans and enhenced scan respectively and the image quality scores, noise levels and radiation close in both groups were compared. Results. There were no significant differences between the arterial and venous phase images quality scores, and no differences between image quality and noise levels in both groups in plain scans （P〉0.05）; The noise lekets were significat qifferences imlosre grous wlien enlienied （P〈0.01）. About 47% of the radiation dose was reduced in Group B than in Group A, which had statistical different （P〈0.01）. Conclusion. Cine segment scanning can not only guarantee the image qualities but effectively reduce the radiation dose in abdominal CT examinations.

关 键 词：体层摄影术 X线计算机 腹部 低剂量 

分 类 号：R814.42[医药卫生—影像医学与核医学]