| LU He-qing,ZHU Guo-ying,ZHUO Wei-hai,et al.Study on children patient dose in single-detector and multi-detector row helical computed tomography[J].Chinese Journal of Radiological Medicine and Protection,2008,28(3):281-285 |
| Study on children patient dose in single-detector and multi-detector row helical computed tomography |
| Received:January 03, 2008 |
| DOI： |
| KeyWords:Helical CT Multi-detector row CT(MDCT) Children in CT Effective dose |
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| Abstract:: |
| Objective To study and evaluate the radiation dose of children patient in single-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 0-1 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 0-1 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 equally 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. |
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