| Zheng Qianqian,Yang Tao,Wang Xiaoshen,et al.The preliminary comparison of the reconstructed doses with electronic portal imaging device (EPID) and dynalogs files for in vivo phantom dosimetry[J].Chinese Journal of Radiological Medicine and Protection,2017,37(4):298-301 |
| The preliminary comparison of the reconstructed doses with electronic portal imaging device (EPID) and dynalogs files for in vivo phantom dosimetry |
| Received:November 10, 2016 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.04.008 |
| KeyWords:Electronic portal imaging device Dynalogs files Volumetric modulated arc therapy In vivo dosimetry |
| FundProject: |
| Author Name | Affiliation | E-mail | | Zheng Qianqian | 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 | | | Yang Tao | Chinese PLA General Hospital, Beijing 100853, China | | | Wang Xiaoshen | Chinese PLA General Hospital, Beijing 100853, China | | | Cong Xiaohu | Chinese PLA General Hospital, Beijing 100853, China | | | Feng Zhongsu | 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 | | | Xu Shouping | Chinese PLA General Hospital, Beijing 100853, China | | | Cheng Jinsheng | 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 | chengjs3393@163.com |
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| Abstract:: |
| Objective To study the difference of the constructed doses between electronic portal imaging device (EPID) and dynalogs files of linac for in vivo phantom dosimetry.Methods Twelve pelvic patients treated with volumetric modulated arc therapy (VMAT) plans were selected and the information of each plan was copied to the "Cheese" phantom to recalculate the doses before delivered on Varian RapidArc Linac. The "Cheese" phantom was placed on the isocenter and the electronic portal image (EPI) formed by the EPID was sent to EPIgray software to reconstruct the actual delivered doses. Meanwhile, dynalogs files were respectively imported to the Mobius software to reconstruct the actual delivered doses too. The point dose in the center of each VMAT plan (the center of the effective sensitive volume of ionization chamber) was measured by the A1SL ionization chamber. At the same time, the dose of sensitive volume of ionization chamber from treatment planning system (TPS) was recorded. Results The relative deviation between the dose from TPS and the measurement results by the ionization chamber was 1.13%. The difference between the reconstructed doses of EPID-based or the "dynalogs file"-based with the measurement results by the ionization chamber was not statistically significant (P>0.05). Conclusions The two methods of dose reconstruction can provide reference for in vivo dosimetry of VMAT. |
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