| Peng Wei,Chen Tiao,Liao Tian,Zhang Zhaoxi,Zheng Lili,Chen Hao,He Yaoyao,Yuan Zilong.To investigate the effect of scan table on CT size-specific dose estimate in children[J].Chinese Journal of Radiological Medicine and Protection,2019,39(7):539-543 |
| To investigate the effect of scan table on CT size-specific dose estimate in children |
| Received:January 14, 2019 |
| DOI：10.3760/cma.j.issn.0254-5098.2019.07.011 |
| KeyWords:Water equivalent diameter Size-specific dose estimate Children Radiation dose Computed tomography |
| FundProject:科技部国家重点专项计划项目（2016YFC0103400） |
| Author Name | Affiliation | E-mail | | Peng Wei | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Chen Tiao | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Liao Tian | South-Central University For Nationalities, Wuhan 430074, China | | | Zhang Zhaoxi | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Zheng Lili | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Chen Hao | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | He Yaoyao | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Yuan Zilong | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | yuanzilong0213@126.com |
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| Abstract:: |
| Objective To investigate the effect of scan table on size-specific dose estimate (size-specific dose estimate, SSDE) in children's CT scan. Methods CT imaging data and CTDIvol of 44 children (15 heads, 13 chests, 16 abdomen-pelvis) who underwent Siemens SOMATOM Definition AS+ 64 row 128-slice CT scan were retrospectively collected. CTDIvol of each patient was recored, WED (water equivalent diameter) was calculated by two different methods (with or without table), donated as WED-T and WED-NT, then the corresponding SSDEWED (SSDEWED-T and SSDEWED-NT) was calculated. And the SSDEWED-NT was used as reference to evaluate the difference between WED and SSDEWED obtained by two different methods. Results Including part of table will lead to the overestimate for WED, with mean differences of 0.10%, 2.82% and 2.54% for head, chest and abdomen-pelvis, respectively, while SSDEWED will be underestimated by 0.06% (head), 2.70% (chest) and 1.59% (abdomen-pelvis). Conclusions Including par of the patient table has a certain effect on SSDEWED for children, more attention should be paid for the application of SSDEWED. |
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