| Yuan Zilong,Wang Guozhu,Zhang Zhaoxi,et al.Comparison of different SSDE methods in evaluating the radiation dose in chest and abdomen CT scan[J].Chinese Journal of Radiological Medicine and Protection,2016,36(11):852-856 |
| Comparison of different SSDE methods in evaluating the radiation dose in chest and abdomen CT scan |
| Received:May 25, 2016 |
| DOI：10.3760/cma.j.issn.0254-5098.2016.11.011 |
| KeyWords:Effective diameter Water equivalent diameter Size-specific dose estimate |
| FundProject:科技部国家重点专项计划项目（2016YFC0103400） |
| Author Name | Affiliation | E-mail | | Yuan Zilong | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Wang Guozhu | Department of Radiology, Taishan Medical University, Taian 271016, China | | | Zhang Zhaoxi | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Zheng Lili | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Du Dongping | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Chen Tiao | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Peng Wei | Department of Radiology, Hubei Cancer Hospital, Wuhan 430079, China | | | Qiu Jianfeng | Department of Radiology, Taishan Medical University, Taian 271016, China | | | Liu Yulin | Hubei Key Laboratory of Medical Information Analysis & Tumor Diagnosis and Treatment, Wuhan 430079, China | liuyl26@163.com |
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| Abstract:: |
| Objective To compare the difference between SSDEED and SSDEWED in evaluating the radiation dose of adult chest and abdomen CT scans. Methods A total of 240 adult patients were performed CT scan for chest or abdomen by Siemens 128 slice CT (161 cases in chest, 79 cases in abdomen), and they were divided into three groups according to the different left-right (LAT) sizes of chest and abdomen (for chest, group A, LAT<30 cm;group B, 30 cm≤LAT≤34 cm;group C, LAT>34 cm;for abdomen, group A, LAT<27 cm; group B, 27 cm≤LAT≤32 cm; group C, LAT>32 cm). The images of middle scanning volume were chosen and measured in elliptic ROIs. The ED, WED and conversion coefficient were calculated, and SSDEED and SSDEWED were calculated by CTDIvol. The difference between SSDEED and SSDEWED in different LAT groups were compared. Results For chest CT, the difference between ED and WED, fsize, ED and fsize, WED, SSDEED and SSDEWED had statistical significance(t=-33.118, 32.552, 28.435, P<0.05). The LAT, ED, WED, SSDEED and SSDEWED between 3 groups also had significant difference (F=273.67, 140.97, 77.05, 19.87, 32.21, P<0.05). For abdomen CT, all parameters had statistically significant difference(t=-24.086, -22.960, 22.457, P<0.05). The LAT, ED, WED, SSDEED and SSDEWED in 3 groups were obviously different (F=123.89, 82.17, 83.16, 52.74, 53.62, P<0.05). Compared with ED, the WED in chest decreased by 12.0%, resulting in SSDEWED increasing about 11.6%. The WED in abdomen increased about 5.2%, resulting in SSDEWED decreasing about 4.8%. Conclusions The WED can represent preferably the size and attenuation characteristics of the patient, and the SSDEWED can be used to accurately evaluatethe patient radiation dose in chest and abdomen CT scanning. |
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