| 翟贺争,程金生,丁艳秋,郭朝辉,齐伟华,王军良,刘立明,刘雅,张红红.二维电离室矩阵探测器的光子剂量学性能测试[J].中华放射医学与防护杂志,2015,35(2):144-148 |
| 二维电离室矩阵探测器的光子剂量学性能测试 |
| Test of dosimetric characteristics of 2-D matrix detector in photon beams |
| 投稿时间：2014-05-23 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.02.017 |
| 中文关键词: 二维矩阵探测器 剂量学特性 质量控制 调强放射治疗 |
| 英文关键词:2-D matrix detector Dosimetric characteristics Quality control IMRT |
| 基金项目:卫生行业科研专项(201002009) |
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| 中文摘要: |
| 目的 研究二维电离室矩阵探测器的剂量学特性,初步建立对其质量控制检测方法.方法 参照IEC 60731-2011报告对电离室剂量学指标的要求,在光子束(60Co γ射线,6、10和15 MV X射线)下,对二维矩阵探测器剂量测量重复性、稳定性、剂量率依赖性、剂量响应线性和电离室间响应一致性等剂量学指标进行测试.结果 二维矩阵探测器在不同能量射线下测量重复性<0.3%,在60Co γ射线下测量6个月的稳定性< 0.5%;在不同能量X射线下,加速器出束10~250 cGy和60Co γ射线下剂量响应线性< 0.5%;在剂量率为200~600 MU/min下测量值最大偏差为0.87%;不同电离室间剂量响应偏差< 1%.结论 二维电离室矩阵探测器具有良好的剂量学特性;初步建立的质量控制检测方法具有可行性,并为放疗质量控制体系的建立提供理论依据. |
| 英文摘要: |
| Objective To explore the dosimetric characteristics of 2-D matrix detector, and to establish method of quality control test.Methods By reference to IEC 60731-2011 requirements on ionization chamber dosimetric indicators, a range of dosimetric indicators of 2-D matrix detector were tested by using photon beams (60Co γ-rays, 6,10 and 15 MV X-rays),including dosimetric repeatability, dose response linearity, dose rate dependency and dose measuring uniformity.Results The reproducibility of 2-D detector was less than 0.3%, and the medium-and long-term stability was less than 0.5%. The dose-response relationship was linear in the range of 10-250 cGy for 6,10,15 MV beams and 60Co photons. The dose linearity was less than 0.5%. The maximum deviation in measurement values was 0.87% in the dose rate range of 200 to 600 MU/min. The dose response derivations between different ionization chambers were less than 1.0%.Conclusions 2-D matrix detector has good dosimetric characteristics and the quality control testing method is feasible. |
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