| 贾陈志,魏坤杰,程晓军.河南省调强放疗光子线束吸收剂量和二维剂量分布验证研究[J].中华放射医学与防护杂志,2018,38(2):125-128 |
| 河南省调强放疗光子线束吸收剂量和二维剂量分布验证研究 |
| Validation study of photon beam absorbed dose and two-dimensional dose distribution in intensity modulated radiotherapy in Henan province |
| 投稿时间：2017-08-19 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.02.009 |
| 中文关键词: 热释光剂量计 胶片 调强放疗 吸收剂量 二维剂量分布 |
| 英文关键词:Thermoluminescent dosimeter Film Intensity modulated radiotherapy Absorbed dose Two-dimensional dose distribution |
| 基金项目:IAEA基金资助项目（17821/CRP） |
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| 中文摘要: |
| 目的 用热释光剂量计（TLD）和胶片测量调强放疗（IMRT）光子线束吸收剂量和二维剂量分布。方法 采用非概率抽样方法，在河南省选择5家三级甲等医院的8台可开展IMRT的医用加速器，TLD放入国家原子能机构（IAEA）提供的聚苯乙烯固体模体（15 cm×15 cm×15 cm）中，经CT扫描，影像传给放射治疗计划系统（TPS）制定放疗计划，源皮距90 cm，深度10 cm，照射野5 cm×5 cm，6 MV X射线，计算吸收剂量6 Gy和相应的监督单位（MU），实施IMRT计划照射模体，测量TLD吸收剂量，同样方法测量胶片吸收剂量。医院的均质固体模体，尺寸30 cm×30 cm，厚度20 cm，25 cm×25 cm的胶片放在模体中，源皮距95 cm，深度5 cm，实施IMRT计划。结果 调查的8台医用加速器中，有7台加速器的TLD吸收剂量相对偏差符合要求，1台加速器不符合要求；胶片吸收剂量相对偏差全部符合要求；7台加速器的二维剂量分布通过率符合要求，1台加速器不符合要求。结论 TLD和胶片用于核查调强放疗多叶光栅野吸收剂量和二维剂量分布，方法简单，可操作性强，适合在我省医院大范围实施IMRT剂量质量核查。 |
| 英文摘要: |
| 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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