轴扫技术在64层螺旋CT腹部检查中降低辐射量的作用  

Low-dose cine scanning technique in abdominal CT examination

作　　者：周智鹏[1] 邱维加[1] 张辉阳[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,桂林541001

出　　处：《放射学实践》2012年第6期669-671,共3页Radiologic Practice

基　　金：广西自然科学基金(2011GXNSFB018084)

摘　　要：目的:研究64层螺旋CT和轴扫技术降低腹部CT检查辐射量的作用。方法:18例腹部CT扫描和复诊两次的患者自身对照,按照就诊顺序分成3组。均采用120kV管电压,自动毫安,噪声指数(NI)设定为8,A组为第一次扫描,采用螺旋扫描;B组为患者复诊时扫描,采用轴扫(Cine,Full)扫描;C组为再次复诊时扫描,采用轴扫(Cine)节段扫描。分别进行平扫和增强动脉期、静脉期扫描,比较各组图像质量、噪声水平和有效辐射量。结果:各组图像平扫、动脉期和静脉期图像得分之间的差异无统计学意义(P>0.05)。平扫3组图像噪声差异无统计学意义,增强后A组和B组图像噪声之间差异无统计学意义(P>0.05),C组和其他两组之间差异有显著统计学意义(P<0.01)。X线辐射量C组比A组降低约46.3%,比B组降低约33.2%的,差异有显著统计学意义(P<0.01),B组比A组降低约19.6%,差异有统计学意义(P<0.05)。结论:轴扫和轴扫节段扫描技术在保证图像质量的同时能有效降低腹部CT扫描的辐射量。Objective：To study the value of low-dose cine segment scanning technique in abdominal CT examination. Methods： all the 18 patients had abdominal CT examination for three times, and the examinations were respectively divided into Group A,Group B and Group C. Group A was performed Smart-mA scanning,while Group B was performed cine scan- ning and Group C was performed eine segment scanning. All examinations included precontrast, postcontrast arterial and portal venous phase. All scanning used 120kV tube voltage, automatic mA; noise index was set to 8 Radiation dose, image quality scores and image noise were compared in each group. Results： Image quality scores had no obvious difference in each group （P〉0.05）. Image noise of precontrast scanning had no obvious difference among the groups （P〉0.05）. Image noise of postcontrast scanning in Group C was significantly higher than the other groups （P〈0.01）, but no obvious difference existed in Group A and Group B （P〉0. 05）. Radiation dose was reduced by 46.3% in Group C compared with that in Group A,while 33.2% of the radiation dose was reduced in Group C than Group B （P〈0.01） ,19.6% of the radiation dose was reduced in Group B than Group A （P〉0.05）. Conclusion： Cine and Cine Segment scanning technique effectively reduce the radiation dose in abdominal CT examination without any sacrifice of the image quality.

关 键 词：体层摄影术 X线计算机 腹部 辐射量 

分 类 号：R816.5[医药卫生—放射医学]