| 郑倩倩,杨涛,王小深,丛小虎,冯仲苏,徐寿平,程金生.基于电子射野影像系统与加速器日志文件重建模体内剂量的初步比较[J].中华放射医学与防护杂志,2017,37(4):298-301 |
| 基于电子射野影像系统与加速器日志文件重建模体内剂量的初步比较 |
| The preliminary comparison of the reconstructed doses with electronic portal imaging device (EPID) and dynalogs files for in vivo phantom dosimetry |
| 投稿时间：2016-11-10 |
| DOI：10.3760/cma.j.issn.0254-5098.2017.04.008 |
| 中文关键词: 电子射野影像系统 日志文件 容积旋转调强放疗 在体剂量测量 |
| 英文关键词:Electronic portal imaging device Dynalogs files Volumetric modulated arc therapy In vivo dosimetry |
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| 中文摘要: |
| 目的 研究基于电子射野影像系统（EPID）与加速器日志文件（dynalogs file）重建模体内剂量的差异性。方法 收集12例盆腔患者的容积旋转调强（VMAT）计划，将计划信息复制到“Cheese”模体上重新计算剂量，而后在瓦里安加速器（RapidArc）上执行，“Cheese”模体置于等中心处获取射野影像（EPI），将EPI传入EPIgray软件中重建剂量。同时利用Mobius软件调用加速器日志文件，实现对模体计划剂量的重建。以A1SL型号的电离室和配套的剂量仪测量整个计划执行结束后射野等中心（电离室中心）处剂量值，在计划系统（TPS）中读取电离室敏感体积体内的平均剂量值（设置电离室中心与等中心重合）。结果 电离室测量值与TPS中读取的等中心处剂量值相比，两者偏差为1.31%。两种方式重建的射野等中心的剂量分别与电离室测量数值相比，差异均无统计学意义（P>0.05）。结论 两种重建体内剂量的方法均能为VMAT在体剂量验证提供参考。 |
| 英文摘要: |
| 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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