CAJ | 학술논문

目的估算儿童接受头部、胸部CT扫描所致其甲状腺剂量及其癌症风险.方法通过医院影像归档和通信系统(PACS)提取某医院2012年接受头部、胸部CT扫描儿童DCIOM文件,利用DCMTK软件获取患者CT扫描参数,使用CT-Expo剂量估算软件估算CT扫描所致患者甲状腺剂量,利用美国电离辐射生物效应委员会(BEIR)Ⅶ风险模型结合中国2008年癌症发病率及寿命表预测单次头部、胸部CT扫描所致儿童甲状腺癌的风险.结果不同年龄段儿童CT扫描参数大致相同,单次头部CT扫描所致儿童(男、女)甲状腺剂量范围为1.2 ～2.0 mGy,其甲状腺癌风险最高的为新生儿(女)9.6/10万人口;单次胸部CT扫描所致儿童(男、女)甲状腺剂量范围约为8.1～38.0 mGy,其甲状腺癌风险最高为新生儿(女)244.7/10万人;CT所致儿童甲状腺剂量与癌症风险均随其年龄的增加而逐渐减小.结论胸部CT扫描所致儿童甲状腺剂量较高,尤其是对于新生儿患者,应注意儿童接受胸部CT扫描时对甲状腺及其他辐射敏感器官的防护.
목적 고산인동접수두부、흉부CT소묘소치기갑상선제량급기암증풍험.방법 통과의원영상귀당화통신계통(PACS)제취모의원2012년접수두부、흉부CT소묘인동DCIOM문건,이용DCMTK연건획취환자CT소묘삼수,사용CT-Expo제량고산연건고산CT소묘소치환자갑상선제량,이용미국전리복사생물효응위원회(BEIR)Ⅶ풍험모형결합중국2008년암증발병솔급수명표예측단차두부、흉부CT소묘소치인동갑상선암적풍험.결과 불동년령단인동CT소묘삼수대치상동,단차두부CT소묘소치인동(남、녀)갑상선제량범위위1.2 ～2.0 mGy,기갑상선암풍험최고적위신생인(녀)9.6/10만인구;단차흉부CT소묘소치인동(남、녀)갑상선제량범위약위8.1～38.0 mGy,기갑상선암풍험최고위신생인(녀)244.7/10만인;CT소치인동갑상선제량여암증풍험균수기년령적증가이축점감소.결론 흉부CT소묘소치인동갑상선제량교고,우기시대우신생인환자,응주의인동접수흉부CT소묘시대갑상선급기타복사민감기관적방호.
Objective To estimate the radiation dose and cancer risk of thyroid for children who underwent head CT or chest CT scans.Methods The parameters used in the CT scans were accessed from the DICOM files through PACS used DCMTK software, then the thyroid radiation dose was estimated with the CT-Expo(C) software and the cancer risk induced by CT scan was projected based on BEIR Ⅱ model combined with the Chinese cancer incidence and lifetime table in 2008.Results CT parameters used for different ages were roughly the same, the thyroid equivalent dose for head CT ranged from 1.2-2.0 mGy, the highest thyroid cancer risk occurs for newborn girls, about 9.6/100 thousand population;while for chest CT the thyroid equivalent dose ranged from 8.1 to 38.0 mGy, the highest thyroid cancer risk was also for newborn girls, about 244.7/100 thousand population.The radiation dose and cancer risk for thyroid decreased with the increased age.Conclusions The radiation dose for thyroid from chest CT was relatively higher than head CT, especially for newborn babies;therefore more protection should be given to the thyroid and other radio-sensitive organs during CT scanning.