| Lu Feng,Chen Rui,Shang Yunying,et al.Flushing-free film test of 192Ir accuracy of position and step distance for afterloading systems[J].Chinese Journal of Radiological Medicine and Protection,2014,34(7):543-546 |
| Flushing-free film test of 192Ir accuracy of position and step distance for afterloading systems |
| Received:September 12, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.07.017 |
| KeyWords:Flushing-free film Afterloading systems 192Ir source Position accuracy Step distance accuracy |
| FundProject:山东省科技发展计划（2009GG10002051） |
| Author Name | Affiliation | E-mail | | Lu Feng | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Chen Rui | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Shang Yunying | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Chen Yue | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Min Nan | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Chen Yingmin | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | | | Deng Daping | Institute of Radiation Medicine, Shandong Academy of Medicine Sciences, Jinan 250062, China | yanzhid@126.com |
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| Abstract:: |
| Objective To study the method of measuring the position accuracy and the step distance accuracy of afterloading system with 192Ir source by using flushing-free film.Methods The position accuracy and the step distance accuracy of a China-made afterloading system with 192Ir source was measured by using GAFCHROMIC® EBT3 flushing-free film. The film was scanned to proper image format, required by dose analysis software, by EPSON PREFACTION V700 PHOTO scanner. Then images are analyzed by using film dose analysis software in SNC Patient 5.2. Results With focus on the center of active section of source, the position accuracy of this afterloading system with 192Ir source was -0.75 mm. Using film analysis could make the step point to tell apart if the step distance was 5 mm away by the method of film analysis, but couldnot make it to tell apart if the step distance was 2.5 mm away. The 2.5 mm step distance accuracy could be judged if the distance between the 1st point and the 3rd point was 5 mm, then the 2.5 mm step distance could be deemed to no deviation. The 5 mm step distance of this afterloading system had no deviation in continuous 9 step points measured by flushing-free film. The indirect measuring results of the 2.5 mm step distance had no deviation as well. The position accuracy of this afterloading system measured with the flushing-free film accorded with the national standards. Conclusions The method of measuring the position accuracy and the step distance accuracy of the afterloading system with 192Ir source by using flushing-free film is technically feasible. |
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