| Jia Chenzhi,Wei Kunjie,Cheng Xiaojun.Validation study of photon beam absorbed dose and two-dimensional dose distribution in intensity modulated radiotherapy in Henan province[J].Chinese Journal of Radiological Medicine and Protection,2018,38(2):125-128 |
| Validation study of photon beam absorbed dose and two-dimensional dose distribution in intensity modulated radiotherapy in Henan province |
| Received:August 19, 2017 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.02.009 |
| KeyWords:Thermoluminescent dosimeter Film Intensity modulated radiotherapy Absorbed dose Two-dimensional dose distribution |
| FundProject:IAEA基金资助项目（17821/CRP） |
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| Abstract:: |
| Objective To validate the absorbed dose and two-dimensional dose distribution from photon beam by using Thermoluminescent dosimeter(TLD) and film for intensity modulated radiation therapy (IMRT). Methods A total of 8 medical accelerators were selected among 5 third-grade first-class hospitals using non-probabilistic sampling method in Henan province. TLDs were put into polytetrafluoroethylene solid phantom with size of 5 cm×15 cm×15 cm provided by IAEA. After CT scanning, the radiotherapeutic plans were formulated through image transmission to the treatment planning system (TPS). The IMRT plan was implemented for measurement of TLD-absorbed doses under the conditions of 5 cm×5 cm field, 90 cm SSD, 10 cm depth, 6 MV photon beam and 6 Gy absorbed dose and corresponding measurement unit (MU). The 25 cm×25 cm film-absorbed dose measurement was made in the same manner as TLD under the conditions of 30 cm×30 cm size, 20 cm thickness, 95 cm SSD and 5 cm depth. Results Of eight accelerators, the requirements can be met for 7 accelerators with respect to the relative deviation of TLD absorbed dose except 1. For film, relative deviations were all consistent with the requirements. The passing rate of two-dimensional dose distribution was in line with the requirements for 7 accelerators except 1. Conclusions TLD and film can be used to check the MLC field absorbed dose and two-dimensional dose distribution. This method is simple, easy to operate and suitable for the implementation of IMRT quality control in hospitals in Henan province. |
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