石家庄市11家医疗机构CT受检者辐射剂量调查与分析

Investigation and analysis of radiation doses to CT examinees in 11 medical institutions in Shijiazhuang,China

目的调查石家庄市部分医疗机构CT受检者不同检查部位(头颅、胸部、腹部)的辐射剂量水平,为进一步优化医疗机构受检者辐射防护提供数据基础。方法2021年3月—2022年3月期间,收集石家庄市内11家医用辐射防护监测点医疗机构的CT设备信息和930例成人和儿童CT受检者基本信息、扫描参数和剂量信息,针对受检者剂量报告进行统计并分析,将结果与国内外诊断参考水平和其他地市的结果进行比较。结果上述调查医院中,儿童组CT受检者的头颅、胸部、腹部的CTDI_(vol)(P_(50))分别为17.42~50.45 mGy、2.13~14.01 mGy、3.58~28.20 mGy,DLP(P_(50))分别为228.87~966.97 mGy·cm、33.20~296.03 mGy·cm、74.90~926.53 mGy·cm;成人组中,CT受检者的头部、胸部、腹部的CTDI_(vol)(P_(50))分别为37.28~54.05 mGy、6.43~14.99 mGy、8.28~18.75 mGy,DLP(P_(50))分别为372.81~630.56 mGy·cm、219.77~467.93 mGy·cm、313.86~689.87 mGy·cm;其中不同等级医院受检者辐射剂量分布差异较大,部分医院尤其是基层医院CT剂量水平明显高于国内外诊断参考水平。结论部分二级和一级医院CT扫描参数设置存在单一化现象,未根据受检者年龄和体型特异性设置扫描参数,在后续检查中应严格遵循放射防护最优化原则,加强辐射剂量优化与监管,降低受检者剂量。

Objective To investigate radiation doses to examinees undergoing computed tomography(CT)scanning of different body parts(the head,chest,and abdomen)in medical institutions of Shijiazhuang,China,and to provide a reference for optimizing radiation protection for examinees in medical institutions.Methods March 2021 to March 2022,eleven medical institutions of radiation monitoring in Shijiazhuang were surveyed for the basic information,scanning parameters,and dosimetric data of a total of 930 adults and children who received CT examinations.The dosimetric data of the subjects were analyzed and compared with the domestic and international diagnostic reference levels and the results of other cities in China.Results In the above hospitals,the CTDI_(vol)(P_(50))of CT subjects in children's group were 17.42-50.45 mGy,2.13-14.01 mGy and 3.58-28.20 mGy,respectively.DLP(P_(50))ranges from 228.87 to 966.97 mGy·cm,33.20 to 296.03 mGy·cm,and 74.90 to 926.53 mGy·cm,respectively.In the adult group,the CTDI_(vol)(P_(50))in the head,chest and abdomen of CT subjects were 37.28-54.05 mGy,6.43-14.99 mGy and 8.28-18.75 mGy,respectively.DLP(P_(50))ranges from 372.81 to 630.56 mGy·cm,from 219.77 to 467.93 mGy·cm,and from 313.86 to 689.87 mGy·cm,respectively.The distribution of radiation doses in different-grade hospitals varied greatly.The abdomen dose of the children's hospital was higher than other hospitals.Especially the primary hospitals were significantly higher than the recommended diagnostic reference level(DRL).Conclusion In some secondary and primary hospitals,the setting of CT scanning parameters was simplified,not specific to the subjects’age and body types.They should strictly comply with the principal of optimizing radiation protection to strengthen radiation dose optimization and supervision,reducing the radiation dose of examinees in future examinations.