| Yang Chunyong,Zhou Yuanyuan,Cao Xingjiang,et al.Verification of doses to PTV and OAR and 2D dose distribution in IMRT for 8 accelerators in Jiangsu province[J].Chinese Journal of Radiological Medicine and Protection,2020,40(2):129-133 |
| Verification of doses to PTV and OAR and 2D dose distribution in IMRT for 8 accelerators in Jiangsu province |
| Received:April 02, 2019 |
| DOI：10.3760/cma.j.issn.0254-5098.2020.02.010 |
| KeyWords:Intensity modulated radiation therapy Radiochromic film Planned target volume Organ at risk Two-dimensional dose distribution |
| FundProject:IAEA资助项目（CPR/17821）；江苏省流行病学重点学科（ZDXKA2016008）；江苏省医学创新团队（CXTDA2017029） |
| Author Name | Affiliation | E-mail | | Yang Chunyong | Department of Radiation Protection, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China | | | Zhou Yuanyuan | Department of Radiation Protection, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China | | | Cao Xingjiang | Department of Radiation Protection, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China | | | Du Xiang | Department of Radiation Protection, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China | | | Luo Suming | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Xue Xian | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | He Zhijian | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Wang Jin | Department of Radiation Protection, Jiangsu Provincial Center for Disease Control and Prevention, Nanjing 210009, China | jinwang@jscdc.cn |
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| Abstract:: |
| Objective To validate the method for measuring the TPV and OAR doses and 2D dose distribution in IMRT through using TLD and radiochromic film. Methods Eight medical linear accelerators (Valian, Elekta, Siemens) were selected. The polystyrene phantom provided by IAEA was CT scanned and the image obtained was transferred to TPS for formulation of treatment plan, prescription of PTV and OAR doses and calculation of corresponding monitoring unit (MU), IMRT was performed on the phantom using 6 MV X-ray. Irradiated TLDs and films were measured and evaluated at the Secondary Standard Dosimetry Laboratory at the Radiation Safety Institute of Chinese Center for Disease Control and Prevention. Results According to IAEA requirement, the relative deviations between TLD-measured and TPS-planned doses were within±7.0% for the prescribed PTV and OAR doses. As measured result, the PTV values for 8 accelerators were in the range of 0.6% to 5.9%, consistent with the IAEA requirements, whereas the OAT values for 8 accelerators were within -0.6% to 7.0%, consistent the requirements. As IAEA required, the 2D dose distribution passing rate of 3 mm/3% should be higher than 90%. The film-measured and TPS-planned values for 8 accelerators were within 90.2% to 100.0%, consistent with the requirements. Conclusions TLD and radiochromic film are feasible in validating the PTV and OAR doses and the 2D dose distribution pass rate in IMRT. This method can be widely used in quality audit and internal verification in IMRT in medical institutiions on a large scale. |
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