| Xu Shucong,Hao Wenhan,Yuan Xinyu,et al.The value of SSDE based on effective diameter and water equivalent diameter in pediatric head CT[J].Chinese Journal of Radiological Medicine and Protection,2022,42(1):69-72 |
| The value of SSDE based on effective diameter and water equivalent diameter in pediatric head CT |
| Received:July 25, 2021 |
| DOI：10.3760/cma.j.cn112271-20210725-00291 |
| KeyWords:Water equivalent diameter Size-specific dose estimate Child Computed tomography |
| FundProject:云南省高校精准放疗科技创新团队（云教发[2020]102号，K1322113） |
| Author Name | Affiliation | E-mail | | Xu Shucong | Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China | | | Hao Wenhan | Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China | | | Yuan Xinyu | Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China | | | Yan Yuchun | Affiliated Children's Hospital, Capital Institute of Pediatrics, Beijing 100020, China | yanyuchun@aliyun.com |
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| Abstract:: |
| Objective To explore the value of size-specific dose estimate (SSDE) based on effective diameter and water equivalent diameter (Dw) in pediatric head CT.Methods A retrospective analysis of 187 children underwent unenhanced head CT scanning were reviewed and divided into 3 groups according to the age:Group 1 (< 1 m), Group 2(≥ 1 m~6 y), Group 3 (≥ 6~14 y). All CTDIvol values were recorded. The central axial image in the scanning range was selected. The region of interest (ROI) containing all anatomical structures (including skin) was outlined and the area of ROI (A ROI), head circumference, average CT value (CTROI) were measured. The Dw, conversion factor fH16 and SSDE were calculated. The CTDIvol, SSDE and the rate of change(Δvalue)were compared among groups. The regression model between CTDIvol and SSDE was established.Results The Dw values of groups 1-3 were (11.24±0.51), (14.48±1.47), (16.69±0.90)mm, respectively. The CTDIvol values were(15.36±2.78), (18.83±4.60), (23.24±4.13)mGy, respectively. SSDE values were(27.92±4.91), (29.16±6.64), (32.38±5.35)mGy, respectively. The differences among Dw, CTDIvol and SSDE groups were all statistically significant (F=207.69、38.48、8.15, P < 0.001). The values of Dw, CTDIvol and SSDE were gradually increasing while the age was increasing. However, the Δ value gradually was decreasing with increasing age. The linear regression equation of CTDIvol and SSDE was established as SSDE=7.252 + 1.137×CTDIvol.Conclusions The radiation dose of children's head CT can be accurately assessed based on Dw combined with head conversion factor fH16 to estimate the body-specific dose SSDE. The radiation dose of children's head CT was underestimated with the greater degree for smaller age. |
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