| Wang Meijiao,Zhang Yibao,Ma Jingchao,Ding Yanqiu,Guo Wen.Simulated measurement of doses from kilovoltage cone beam CT based on a 5 years old pediatric anthropomorphic phantom[J].Chinese Journal of Radiological Medicine and Protection,2018,38(4):302-306 |
| Simulated measurement of doses from kilovoltage cone beam CT based on a 5 years old pediatric anthropomorphic phantom |
| Received:January 12, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.04.011 |
| KeyWords:Thermoluminescent dosimeter (TLD) Pediatric Kilo-voltage cone beam CT Image-guided radiotherapy |
| FundProject:国家自然科学基金（11505012）；北京市自然科学基金（7172048）；首都卫生发展科研专项（首发2018-4-1027） |
| Author Name | Affiliation | E-mail | | Wang Meijiao | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhang Yibao | Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education), Department of Radiotherapy, Peking University Cancer Hospital & Institute, Beijing 100142, China | | | Ma Jingchao | Department of Radiotherapy, Jilin Guowen Hospital, Gongzhuling 136100, China | | | Ding Yanqiu | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Guo Wen | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | guowen@nirp.chinacdc.cn |
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| Abstract:: |
| Objective To use thermoluminescense dosimeters (TLDs) to evaluate the radiation doses to various critical organs in the computerized imaging reference systems (CIRS) 5 years old pediatric anthropomorphic phantom result ing from Varian kilovoltage cone beam CT (kV-CBCT) system based on the standard scanning protocols. Effective dose were also calculated based on dose measurement. Methods A batch of TLDs with consistency no larger than 2% were selected and annealed. First, the doses in an anthropomorphic pelvic phantom were measured using a CT chamber and TLDs, respectively, based on the standard pelvic protocols. The ratio of the both measurements is the TLD conversion coefficient. Other TLDs from the same batch were placed between two tissue-equivalent inserts and placed into the pre-drilled organ cavities of the pediatric phantom. By using standard protocols, the organs dose were measured, based on which the corresponding effective doses were calculated. Results The TLD conversion coefficient was 3.91 mGy/per reading. By using the standard head, low-dose thorax, pelvis protocol, the whole body effective dose was 0.63, 6.85 and 19.3 mSv, respectively. Conclusions It is feasible for using the CT chamber-calibrated TLDs to measure the radiation doses from kV-CBCT to pediatric anthropomorphic phantom. The effective dose in pelvic protocol was higher than in thorax and head protocol, indicating that the pelvic protocol has a penitential to lead to larger radiation damage and higher risk of secondary cancer. |
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