口腔COPT与CBCT受检者入射体表剂量对比研究  

Comparative study on the entrance surface dose of oral COPT and CBCT subjects

作　　者：田青香 娄云 王宏芳[1,2] 王新明 TIAN Qingxiang;LOU Yun;WANG Hongfang;WANG Xinming(Beijing Central for Preventive Mediciine Research, Beijing 100013 China;Beijing Central for Disease Control and Prevention)

机构地区：[1]北京市预防医学研究中心,北京100013 [2]北京市疾病预防控制中心

出　　处：《中国辐射卫生》2018年第1期48-51,共4页Chinese Journal of Radiological Health

摘　　要：目的比较口腔计算机曲面断层摄影(computed orthopantomography,COPT)和口腔颌面锥形束立体断层扫描(cone beam CT,CBCT)两种扫描方式受检者入射体表剂量(Entrance Surface Dose,ESD)的大小。方法用热释光剂量法(TLD)模拟测量两类口腔CT在进行COPT和CBCT扫描时所致受检者的入射体表剂量。实验时将热释光剂量计元件布放于人体仿真头部模体的12个关注点位,采用RGD-3B型热释光剂量仪对元件进行剂量测量。结果 A设备两种模式在COPT临床常用照射条件下,CBCT受检者入射体表剂量高于COPT受检者(P<0.01),二者剂量比为1.2~9.8倍;B设备两种模式在各自临床常用照射条件下,CBCT受检者入射体表剂量高于COPT受检者(P<0.01),二者剂量比为1.8~14.4倍。结论口腔科医生应正确认识COPT和CBCT两种检查方法对受检者的辐射剂量,合理选用照射条件,严格掌握适应症,指导受检者正确使用个人防护用品,将辐射危害降低到可合理达到的尽可能低的水平。Objective For comparison of the entrance surface doses in the two types of computed orthopantomography(COPT） and cone beam CT(CBCT）. Methods The thermoluminescence dosimeter(TLD） was used to measure the entrance surface doses(ESD） undergoing oral scans with COPT and CBCT in two types of oral CT. In the experiments,the TLD elements were placed at 12 focused points of the head phantom,and their doses were measured by the RGD-3 Breading system. Results For the two types of CT under COPT routinely using conditions,the ESDs of CBCT were all higher than those of COPT,and the ratios ranged from 1. 2 to 9. 8 and 1. 8 to 14. 4 for type A and type B device,respectively. Conclusion Dentists should realize different doses from the two inspection methods of COPT and CBCT,and select appropriate exposure conditions,guide the examinees to use the personal protective equipment correctly,in order to reduce radiation hazard to the lowest possible level.

关 键 词：口腔计算机曲面断层摄影 口腔颌面锥形束立体断层扫描 热释光剂量计 入射体表剂量 头部模体 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]