CAJ | 학술논문

目的研究和评价儿童受检者在单层与多层螺旋CT扫描中所受到的辐射剂量.方法测试21台CT机的头部和体部剂量指数,并结合0～1岁组、5岁组、lO岁组儿童和成年人的头部和胸部常规扫描条件,计算CTDI、CTDIvol、 DLP值,再由DLP与有效剂量转换系数计算头部和胸部常规扫描所致各年龄组儿童和成年人的有效剂量.结果单位mAs的头部CTDI大于体部CTDI;在头部常规扫描中,0～l岁组、5岁组、lO岁组儿童受到的有效剂量分别为2.2、1.3、1.1 mSv;在胸部常规扫描中,0～1岁组、5岁组、10岁组儿童受到的有效剂量分别为5.3、3.1、3.4 mSv;每单位mAs所致儿童有效剂量平均比成人高1.8倍;多层CT的儿童头部CTDIvol、DLP、有效剂量值均大于单层与双层CT,多层与双层CT的儿童胸部CTDIvol、DLP、有效剂量值均小于单层CT.结论与成年人相比,儿童在CT检查中可能受到更大辐射危害,应严格遵循儿童CT检查适应证,并合理选择CT扫描参数,尽可能降低儿童受到的辐射剂量.
목적 연구화평개인동수검자재단층여다층라선CT소묘중소수도적복사제량.방법 측시21태CT궤적두부화체부제량지수,병결합0～1세조、5세조、lO세조인동화성년인적두부화흉부상규소묘조건,계산CTDI、CTDIvol、 DLP치,재유DLP여유효제량전환계수계산두부화흉부상규소묘소치각년령조인동화성년인적유효제량.결과 단위mAs적두부CTDI대우체부CTDI;재두부상규소묘중,0～l세조、5세조、lO세조인동수도적유효제량분별위2.2、1.3、1.1 mSv;재흉부상규소묘중,0～1세조、5세조、10세조인동수도적유효제량분별위5.3、3.1、3.4 mSv;매단위mAs소치인동유효제량평균비성인고1.8배;다층CT적인동두부CTDIvol、DLP、유효제량치균대우단층여쌍층CT,다층여쌍층CT적인동흉부CTDIvol、DLP、유효제량치균소우단층CT.결론 여성년인상비,인동재CT검사중가능수도경대복사위해,응엄격준순인동CT검사괄응증,병합리선택CT소묘삼수,진가능강저인동수도적복사제량.
Objective To study and evaluate the radiation dose of children patient in sirIgle-detector and multi-detector row helical CT scan.Methods The head and body CT dose index of 21 CT scanners were tested.Then the values of CTDIw,CTDIvol and DLP were calculated combining with the parameters of routine head and chest scan for children of 0-1 year old group,5 years old group,10 years old group and adults.The effective doses of children of every age group and adults in routine head and chest scan were subsequently estimated from effective dose per DLP by age and the calculated values of DLP.Results CTDI per mAs is greater in the head than that in the body.In head routine scan,the effective doses of 0-l year old group,5 years old proup and 10 year old group were 2.2,1.3 and 1.1 mSv,respectively.In chest routine scan,the effective doses of 0-l year old group,5 years old group and 10 years old group were 5.3,3.1 and 3.4 mSv,respectively.Effective doses to children per mAs are equaUy 1.8 times higher than corresponding values for adults.The CTDIvol,DLP and effective dose to children in head routine scan for MDCT were greater those that for single-detector CT and dual- detector CT.The CTDIvol,DLP and effective dose to children in chest routine scan for MDCT and dual-detector row CT were smaller than that for single-detector row CT.Conclusions Children are more radiation risk in CT examination as compared with adults.So we should strictly abide by justification of children CT examination,and optimize the parameters of CT scan rationally in order to reduce the radiation dose to children patient as much as possible.