| Ma Yangguang,Wang Tao,Liu Shuaipeng,et al.Establishment and evaluation of a daily quality assurance tool for LINAC based on electronic portal image device[J].Chinese Journal of Radiological Medicine and Protection,2019,39(4):280-284 |
| Establishment and evaluation of a daily quality assurance tool for LINAC based on electronic portal image device |
| Received:October 29, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2019.04.007 |
| KeyWords:Electron portal image device Linac Daily quality assurance Quality control |
| FundProject:河南省高等学校重点科研项目计划（19B416005）；河南省科技厅科技攻关计划（182102310369）；河南省医学科技攻关计划项目（201602035） |
| Author Name | Affiliation | E-mail | | Ma Yangguang | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Wang Tao | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Liu Shuaipeng | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Li Hongwei | Department of Radiation Oncology, The Third People's Hospital of Zhengzhou, Zhengzhou 450000, China | | | Ji Chuanxian | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Huo Jia | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | | | Wang Xuemin | Department of Radiotherapy Hospital Unit Radiation Therapy, Shanxi Provincial Tumor Hospital, Xi'an 710061, China | | | Niu Rui | Department of Radiation Oncology, Puyang Oilfield General Hospital, Puyang 457001, China | | | Guo Yuexin | Department of Radiation Oncology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China | guoyx0371@126.com |
|
| Hits: 3595 |
| Download times: 1970 |
| Abstract:: |
| Objective To establish and evaluate a morning check system for linac based on electronic portal image device (EPID). Methods Delivered fluence maps of open and wedge fields at 10 cm×10 cm field size of Synergy Linac were measured by EPID. Figure features from these two images were extracted with matlab codes and analyzed to realize a quick morning check. The repeatability of dose response and mechanical setup, relationship between gray value and machine unit (MU), accuracy of output and field size test were investigated with both EPID and DailyQA3. The status of Synergy linac was monitored both by DailyQA3 and EPID for two months. Results EPID was able to test the linac consistently with a testing error of 0.50 mm, 1.00 mm for field size and center, respectively. Both of the test accuracy for flatness and symmetry was 0.17%. The mechanical accuracy test and dosimetric repeatability test were also consistent. The dose response of EPID was linearly related to the linac output (R2>0.999). EPID was highly sensitive to the change of output and radiation field size.The measurement deviations between EPID and DailyQA3 were consistent and within clinical acceptable tolerance. Conclusions EPID showed great accuracy and stability on monitoring the performance of linac. The established daily check tool based-on EPID is accurate and reliable for clinical usage. |
| HTML View Full Text View/Add Comment Download reader |
| Close |
|
|
|
