河南省CT检查所致受检者剂量调查与分析  

Investigation and analysis of CT doses to examined individuals in Henan province

作　　者：赵艳芳 楚彩芳 张钦富 程晓军 李永兴 罗晓芳 董柄臣 武丽 Zhao Yanfang;Chu Caifang;Zhang Qinfu;Cheng Xiaojun;Li Yongxing;Luo Xiaofang;Dong Bingchen;Wu Li(Radiological Health Department,Henan Institute for Occupational Medicine,Zhengzhou 450052,China)

机构地区：[1]河南省职业病防治研究院放射卫生科,郑州450052

出　　处：《中华放射医学与防护杂志》2020年第3期227-232,共6页Chinese Journal of Radiological Medicine and Protection

基　　金：2018年度河南省医学科技攻关计划联合共建项目(2018020572)。

摘　　要：目的研究河南省CT检查所致儿童和成人受检者的剂量水平,探讨其影响因素,为制定我国和地区CT诊断参考(指导)水平提供基础资料。方法采用分层配额抽样方法选取河南省7个地市31台CT共计1113例受检者主要检查类型进行剂量调查,调查内容包括受检者和设备基本信息、扫描参数、相关剂量学信息等,通过剂量转换系数估算其所致典型有效剂量。结果头部常规CT扫描中,0~1岁、>1~5岁、>5~10岁、>10~15岁组儿童CTDIw的75%分位值分别为32.2、37.2、43.0、46.7 mGy,DLP的75%分位值分别为478.0、572.0、715.6、743.9 mGy·cm,有效剂量分别为5.26、3.83、2.86、2.38 mSv;在胸部常规扫描中,0~1岁、>1~5岁、>5~10岁、>10~15岁组儿童CTDIw的75%分位值均为9.3 mGy,DLP的75%分位值分别为141.7、178.8、224.0、238.7 mGy·cm,有效剂量分别为5.53、4.64、4.03、3.10 mSv。CT检查所致成人受检者头部、胸部、腹部CTDIw的75%分位值分别为57.4、16.2、19.4 mGy,DLP的75%分位值分别为818.3、504.7和571.1 mGy·cm,有效剂量分别为1.72、7.07和8.57 mSv。结论随着河南省CT设备的更新,检查技术的日益进步以及CT应用频度的快速增长,医疗机构应恰当选取CT各类检查的扫描参数,加强其影像质量及其所致剂量的优化匹配研究,完善CT诊断参考(指导)水平,尤其是对射线敏感的儿童应尽快建立诊断参考(指导)水平,推动CT检查医疗照射防护最优化。Objective To study the level of doses which children and adults received from CT examinations in Henan province,and to explore the influencing factors,so as to provide basic data for the development of diagnostic reference(guidance)level for CT examination in China and related regions.Methods A total of 1113 subjects,which have received examinations by 31 CT scanners separately in 7 cities of the province,were selected using stratified quota sampling method to carry out the dose survey,including basic information on subjects,equipment,scanning parameters,and dosimetry,etc.Typical effective dose was estimated by using dose conversion coefficient.Results In the conventional CT scanning of head.The 75%of CTDIw for children aged 0-1,>1-5,>5-10 and>10-15 years were 32.2,37.2,43.0 and 46.7 mGy;75%of DLP were 478.0,572.0,715.6 and 743.9 mGy·cm and effective doses were 5.26,3.83,2.86 and 2.38 mSv,respectively.In the routine chest scanning,75%of CTDIw for children aged 0-1,>1-5,>5-10 and>10-15 years were all 9.3 mGy.The 75%of DLP were 141.7,178.8,224.0 and 238.7 mGy·cm;and effective doses were 5.53,4.644.03 and 3.10 mSv,respectively.75%of CTDIw for head,chest and abdomen of the adult subjects from CT examinations were 57.4,16.2 and 19.4 mGy,respectively.The 75%of DLP were 818.3,504.7 and 571.1 mGy·cm,respectively,and effective doses were 1.72,7.07 and 8.57 mSv,respectively.Conclusions As the update of CT equipment,increasing progress in examination technology and rapid increase in CT application frequency,medical institutions should choose the scanning parameters with respect to various types of CT scanner to optimize the image quality and the radiation doses.The diagnostic reference level for CT examination should be improved,especially for children.

关 键 词：CT CT剂量指数 剂量长度乘积 有效剂量 诊断参考水平 

分 类 号：R[医药卫生]