| Zhai Hezheng,Cheng Jinsheng,Ding Yanqiu,et al.Test of dosimetric characteristics of 2-D matrix detector in photon beams[J].Chinese Journal of Radiological Medicine and Protection,2015,35(2):144-148 |
| Test of dosimetric characteristics of 2-D matrix detector in photon beams |
| Received:May 23, 2014 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.02.017 |
| KeyWords:2-D matrix detector Dosimetric characteristics Quality control IMRT |
| FundProject:卫生行业科研专项(201002009) |
| Author Name | Affiliation | E-mail | | Zhai Hezheng | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Cheng Jinsheng | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | chengjs3393@163.com | | Ding Yanqiu | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Guo Zhaohui | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Qi Weihua | 军事医学科学院附属医院 | | | Wang Junliang | 军事医学科学院附属医院 | | | Liu Liming | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Liu Ya | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Zhang Honghong | Key Laborarory of Radiological Protection and Nudear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | |
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| Abstract:: |
| 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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