| Liao Tian,Yuan Zilong,Niu Yantao,et al.Size-specific dose estimations in children's head CT scans[J].Chinese Journal of Radiological Medicine and Protection,2021,41(7):524-528 |
| Size-specific dose estimations in children's head CT scans |
| Received:October 20, 2020 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.07.009 |
| KeyWords:Size-specific dose estimate Children Head Computed Tomography |
| FundProject: |
| Author Name | Affiliation | E-mail | | Liao Tian | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Yuan Zilong | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Niu Yantao | Department of Radiology, Beijing Tongren Hospital, Beijing 100005, China | | | Fu Qing | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Liu Xiaoming | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Yang Ming | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Wu Hongying | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Lei Ziqiao | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Yu Jianming | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | | | Kong Xiangchuang | Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Hubei Province Key Laboratory of Molecular Imaging, Wuhan 430022, China | hongke80@163.com |
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| Abstract:: |
| Objective To investigate the value of the size-specific dose estimate (SSDE) on dose estimations of children's head CT scans. Methods A retrospective study was conducted on plain head CT scans of 252 patients with the 64-row detector CT device of Discovery 750HD in the Union Hospital, Tongji Medical College, Huazhong University of Science and Technology from January to September in 2019. The volume CT dose index (CTDIvol)values were recorded. The head circumference (HC), area, and CT value were measured using a self-developed computer program, and the water equivalent diameter (WED), size-specific conversion factors (f293 and f220), and absorbed dose (SSDE293 and SSDE220) were calculated according to the AAPM reports 293 and 220.The patients were divided into three groups by the quartering meth odaccording to their HC(<47.8 cm, 47.8-52.7 cm, >52.7 cm) and four groups based on their ages(0-2, 3-6, 7-10 and 11-14 years old).The difference between parameters (f220 and f293,SSDE220 and SSDE293、SSDE293 and CTDIvol) were compared for different groups, and the correlation of HC with f293 and SSDE293 was analyzed. Results There was an overestimation of f220 by 11.11% (t=252.61,P<0.05) compared with f293. SSDE220 was overestimated by 10.31% (t=228.21, P<0.05) compared with SSDE293, and SSDE293 was underestimated by 9.60% (t=-31.34,P<0.05) compared with CTDIvol. For the three HC groups, SSDE220 was overestimated by 8.54%, 10.37%, and 11.57% (t=73.73, 438.58, 275.52,P<0.05) compared with SSDE293, and SSDE293 was underestimated by 1.30%, 9.79%,and 14.61% (t=-1.91,-60.95,-47.64, P<0.05) compared with CTDIvol. For the four age groups SSDE220 was overestimated by 8.45%, 10.00%, 10.57%,and 11.36% (t=63.58, 232.29, 247.84, 302.95, P< 0.05) compared with SSDE293, and SSDE293 was underestimated by 1.49%, 8.27%, 10.63%,and 13.78% (t=-1.83,-28.27,-37.30,-49.80, P< 0.05) compared with CTDIvol. Furthermore, HC was highly correlated with f293 and SSDE293 (r2=0.88 and 0.76, respectively, P< 0.05). Conclusions The radiation dose in children's head CT scanning can be more accurately estimated according to the AAPM Report 293, while it can be overestimated by CTDIvol. Meanwhile, the CT radiation dose can be patently overestimated with the AAPM Report 220 compared with Report 293.HC is closely correlated with f293 and SSDE293 and it can be used to estimatee more accurately for SSDE and the radiation dose received by children during head CT scanning. |
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