CAJ | 학술논문

目的了解儿童CT检查扫描条件选择及其所致辐射剂量的相关性,以期通过适当调节mAs、扫描长度等参数,降低儿童CT检查患者受照剂量.方法比较江苏省7家医院不同年龄组(＜1岁、1～5岁、6～10岁和11 ～15岁)儿童头颅、胸部、腹部多排螺旋CT检查主要扫描参数的差异.选用相同的检查参数在TM160剂量模体上测量CTDI100,计算DLP,并通过经验加权因子,估算出不同部位检查的有效剂量(E).对mAs、扫描长度和DLP进行多元线性回归分析,比较两家典型医院由于选择扫描条件不同所导致的剂量差异.结果儿童头颅、胸部、腹部CT检查所致患者的有效剂量均值分别为2.46、5.69、11.86 mSv,各部位检查DLP与mAs、扫描长度均呈正相关(r=0.81、0.81、0.92,P＜0.05).较高的mAs选择,致使本研究各年龄组儿童胸腹部CT检查有效剂量是德国Galanski等研究的1.2～3.0倍;B医院各年龄组腹部检查选择了较高的扫描长度,以致其所致有效剂量均高于本研究均值.结论建议通过合理优化儿童不同部位CT检查mAs、扫描长度等扫描参数,降低受检者所受辐射风险.
목적 료해인동CT검사소묘조건선택급기소치복사제량적상관성,이기통과괄당조절mAs、소묘장도등삼수,강저인동CT검사환자수조제량.방법 비교강소성7가의원불동년령조(＜1세、1～5세、6～10세화11 ～15세)인동두로、흉부、복부다배라선CT검사주요소묘삼수적차이.선용상동적검사삼수재TM160제량모체상측량CTDI100,계산DLP,병통과경험가권인자,고산출불동부위검사적유효제량(E).대mAs、소묘장도화DLP진행다원선성회귀분석,비교량가전형의원유우선택소묘조건불동소도치적제량차이.결과 인동두로、흉부、복부CT검사소치환자적유효제량균치분별위2.46、5.69、11.86 mSv,각부위검사DLP여mAs、소묘장도균정정상관(r=0.81、0.81、0.92,P＜0.05).교고적mAs선택,치사본연구각년령조인동흉복부CT검사유효제량시덕국Galanski등연구적1.2～3.0배;B의원각년령조복부검사선택료교고적소묘장도,이치기소치유효제량균고우본연구균치.결론 건의통과합리우화인동불동부위CT검사mAs、소묘장도등소묘삼수,강저수검자소수복사풍험.
Objective To reduce the radiation dose to children from CT scanning through proper adjustment to milliamps (mAs) and scan lengths with a view to learning the relationship between scanning condition and radiation dose.Methods To compare the differences in main scanning parameters used for head,chest and abdomen at multi-detector CT examination of paediatric patients (＜ 1 year old,1-5 years old,6-10 years old,11-15 years old) at seven hospitals in Jiangsu province.CT dose index (CTDI) and dose-length-product (DLP) were gained by using standard children dose model (diameter 16 cm) under the same scanning conditions.Effective doses (E) at different parts of the body from children CT scanning were estimated after modification by empirical weighting factor.Statistical analyses of mAs,scan lengths and DLP were performed with SPSS 16.0 software.The differences in radiation dose due to the choice of condition of scanning were compared between two typical hospitals.Results The mean values of effective doses to paediatric patients during head,chest and abdomen CT scanning were 2.46,5.69,11.86 mSv,respectively.DLP was correlated positively with mAs and scan length (head,chest and abdomen examination,r =0.81,0.81,0.92,P ＜0.05).Due to higher mAs used,the effective dose from chest and abdomen CT examination among all age groups was higher than that in Germany Galanski research.Due to larger scanning length in abdominal examination among all age groups,effective doses in hospital were the highest.Conclusions Reasonablely reducing the scan length and mAs during CT scanning could lower children's CT radiation risk,while clinical diagnosis is not affected.