中华放射医学与防护杂志

苏垠平,肖国兵,陈俊波,傅颖华,高超,孙全富.头、胸部CT扫描所致儿童甲状腺剂量估算及其癌症风险预测[J].中华放射医学与防护杂志,2015,35(11):854-858

头、胸部CT扫描所致儿童甲状腺剂量估算及其癌症风险预测

Estimated radiation dose in the thyroid and thyroid cancer risk attributed to head or chest CT scans for pediatric patients

投稿时间：2015-02-26

DOI：10.3760/cma.j.issn.0254-5098.2015.11.013

中文关键词: CT 辐射致癌风险终生癌症风险

英文关键词:CT Cancer risk induced by radiation Lifetime cancer risk

基金项目:卫生行业科研专项项目(201002009)

作者	单位	E-mail
苏垠平	100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室
肖国兵	宁波市卫生监督所职业卫生监督科
陈俊波	宁波市鄞州第二医院(陈俊波)
傅颖华	100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室
高超	宁波市卫生监督所职业卫生监督科
孙全富	100088 北京, 中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室	qfusun@nirp.cn

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中文摘要:

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。

英文摘要:

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^© software and the cancer risk induced by CT scan was projected based on BEIR Ⅶ 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.

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