| Sun Gangtao,Zhou Wenshan,Ye Song,et al.Verification of doses to PTV and OAR and 2D dose distribution in IMRT for 7 accelerators in Hubei province[J].Chinese Journal of Radiological Medicine and Protection,2020,40(2):134-139 |
| Verification of doses to PTV and OAR and 2D dose distribution in IMRT for 7 accelerators in Hubei province |
| Received:March 19, 2019 |
| DOI：10.3760/cma.j.issn.0254-5098.2020.02.011 |
| KeyWords:Intensity modulated radiation therapy Radiochromic film Planned target volume Organ at risk Two-dimensional dose distribution |
| FundProject:IAEA资助项目（CRP/17821）；湖北省卫生计生科研基金资助（WJ2018H247） |
| Author Name | Affiliation | E-mail | | Sun Gangtao | Department of Radiological Health Monitoring and Evaluation, Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China | | | Zhou Wenshan | Department of Radiological Health Monitoring and Evaluation, Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, China | | | Ye Song | Department of Radiological Health Monitoring and Evaluation, Hubei Provincial Center for Disease Control and Prevention, Wuhan 430079, 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 | | | 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 | sumingluo@163.com |
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| Abstract:: |
| Objective To study a method to measure the doses to planned target volume (PTV) and organ at risk (OAR) and 2D dose distribution in IMRT by using TLD and radiochromic film for a verification purpose. Methods Totally 7 different types of medical linear accelerators were selected from seven hospitals in Hubei province. A polystyrene phantom provided by IAEA was CT scanned and then the scanned images were returned to the Treatment Planning System (TPS) for determining the prescribed doses to PTS and OAR and the corresponding MU. After the phantom was irradiated with 6 MV X-ray, the TLDs and films were transmitted to the secondary standard dosimetry laboratory of China CDC for measurement and estimation. Results The IAEA required the relative deviations between TLD-measured and TPS-planned doses to OAR and PTV be within±7.0%. For PTV, the measured-to-planned deviation values for 7 accelerator were within -5.4% to 6.5%, all consistent with the IAEA requirements. For OAR, the values for 5 accelerators were within -2.2% to 6.7%, not consistent the requirements, whereas the values for the other 2 were -8.6% and 8.2% respectively, beyond the required values. The IAEA required that the 2D dose distribution 3 mm/3% pass rate be higher than 90%. The measured values for 7 accelerators were in the range of 90.3%-98.9%, all consistent with the requirements. Conclusions It is feasible scientifically and easy to operate in practice for using TLD and film to carry out dose verification in IMRT. It would be advisable to apply this method to quality verification in IMRT in medical institutions to the extent possible. |
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