胶片剂量仪与半导体探测器在小野剂量数据测量中的比较分析

doi:10.3969/j.issn.1000-1158.2020.07.18

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摘要小照射野的建模数据对于调强放射治疗和立体放射治疗十分重要。在加速器使用6MV光子束条件下,采用胶片与0.01cm³的半导体探头,在IBA Blue Phantom 2水箱与固体水中,测量0.6cm×0.6cm至10.0cm×10.0cm照射野的百分深度剂量(PDD)曲线、profile、点剂量等数据,并计算射野总散射因子Scp。测试结果表明:对于PDD曲线,不同的照射野情况下,半导体探头与胶片在建成区测得数据基本吻合,在水深2～10cm测量结果存在微小偏差,当水深超过10cm以后差距明显(达7%);对于profile曲线,不同照射野下,胶片与半导体探头测量数据无明显差异,但胶片具有更好的空间分辨率,体现在半影区剂量跌落更明显;半导体探头、胶片剂量仪测得的点剂量与计划系统计算相同深度的点剂量比较,差异明显(最大误差分别为-2.7%、12%)。分析得出:不同的测量探头,对小野物理数据测量的准确性可能存在很大差异;胶片剂量仪具有优越的空间分辨率,但是胶片的吸收剂量范围有限,具有能量和方向依赖性。

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	高翔
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关键词 ：计量学, 小野剂量, 小照射野, 百分深度剂量, 半导体探测器, 胶片剂量仪, 组织最大剂量比

Abstract：For precise radiotherapy, especially stereotactic radiotherapy and intensity-modulated radiotherapy, the small irradiation field modeling data is particularly important. The tissue maximum dose ratio, the profile, point dose and total scattering factor Scp were measured and calculated under the condition of the accelerator with 6MV photons, using the film and diode detector, with 0.01cm³in IBA Blue Phantom 2 tank and solid water, measuring the irradiation field of 0.6cm×0.6cm～10.0cm×10.0cm. The results showed: For percentage depth dose (PDD) curves, the measured data of digital diode detector and film in built-up area were basically consistent in different exposure fields, and there was a small deviation in the measurement results in water depth of 2～10cm, with a significant difference after water depth of 10cm (almost 0.07). For the profile curve, there was no significant difference between the measured data of film and finger diode detector under different irradiation fields. Conclusions were drawn as follows: (1)For different measuring probe, the accuracy of the physical measurements may differ greatly.(2)Film dosimeter has superior spatial resolution, but film absorbed dose range is limited, energy and directional are dependenced.

Key words： metrology small field dosimetry small radiation field percentage depth dose diode detector film dosimeter tissue maximum ratio

收稿日期: 2019-07-24 发布日期: 2020-06-29

PACS:

TB98

通讯作者: 石丽婉(1973-),女,福建漳州人,厦门大学高级物理师,从事肿瘤放射治疗及质量控制研究。 Email: shiliwan34@hotmail.com E-mail: 405847731@qq.com

作者简介: 高翔(1987-),男,山东潍坊人,厦门大学物理师,硕士,从事肿瘤放射治疗及质量控制研究。 Email: 405847731@qq.com

引用本文:

高翔,余燕娟,石丽婉. 胶片剂量仪与半导体探测器在小野剂量数据测量中的比较分析[J]. 计量学报, 2020, 41(7): 873-878.
GAO Xiang,YU Yan-juan,SHI Li-wan. Comparative Analysis of Film Dosimeter and Diode Detector in Small Field Dosimetry. Acta Metrologica Sinica, 2020, 41(7): 873-878.

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［1］孙文钊, 张丹丹, 邓小武. 半导体和电离室探头在直线加速器数据测量中的比较与分析［J］. 中国医学物理学杂志, 2014, 31(1): 4626-4630.
Sun W Z, Zhang D D, Deng X W. Analysis and Comparison of Data of Linear Accelerators Measured with Diode and Ionization Detector［J］. Chinese Journal of Medical Physics, 2014, 31(1): 4626-4630.
［2］陈利, 陈立新, 孙洪强, 等. 直线加速器小照野物理数据的测量和比较［J］. 癌症, 2009, 28(3): 328-332.
Chen L, Chen L X, Sun H Q, et al. Measurements and comparisons for data of small beams of linear accelerators［J］. Chinese Journal of Cancer, 2009, 28(3): 328-332.
［3］胡逸民. 肿瘤放射物理学［M］. 北京:原子能出版社, 1999.
［4］蔡汉飞, 裴元吉, 沈学明, 等. 高能光子相对输出因子的测量与分析［J］. 中国医学物理学杂志, 2009, 26(4): 1273-1276.
Cai H F, Pei Y J, Shen X M, et al. Measurement and Analysis of Relative Output Factor for High Energy Photons［J］. Chinese Journal of Medical Physics, 2009, 26(4): 1273-1276.
［5］王志鹏, 邢书明, 王坤, 等. 高能X射线下水等效材料对水的等效性研究［J］. 计量学报, 2020, 41(2): 257-262.
Wang Z P, Xing S M, Wang K,et al. Study on the Equivalence of Water Equivalent Materials to Water under High-energy X-ray［J］. Acta Metrologica Sinica, 2020, 41(2): 257-262.
［6］王志鹏, 王坤, 金孙均, 等. 医用加速器高能光子束水吸收剂量测量及不确定度分析［J］. 计量学报, 2019, 40(6): 1124-1128.
Wang Z P, Wang K, Jin S J, et al. Measurement and Uncertainty Analysis of Absorbed Dose to Water of High-energy Photons in Medical Accelerator［J］. Acta Metrologica Sinica, 2019, 40(6): 1124-1128.
［7］张黎, 邓小武, 黄晓延, 等. 应用辐射直接显色剂量胶片测量高能光子线的表面和建成区剂量［J］. 中国医学物理学杂志, 2007, 24(3): 157-159.
Zhang L, Deng X W, Huang X Y, et al. Surface and Build-up Region Dose Measurement Using Radiochromic Film for Megavoltage Photon Beam Irradiation［J］. Chinese Journal of Medical Physics, 2007, 24(3): 157-159.
［8］辛欣. 放疗加速器小野剂量参数的蒙卡模拟［D］. 长春: 吉林大学, 2016.
［9］冯仲苏. 医用直线加速器不同辐射野光子线水吸收剂量的蒙特卡罗模拟［D］. 北京: 中国疾病预防控制中心, 2016.
［10］杨耕, 王学涛, 张白霖, 等. 基于蒙特卡罗模拟的调强放疗计划剂量验证的应用研究［J］. 中华放射医学与防护杂志, 2017, 37(5): 384-388.
Yang G, Wang X T, Zhang B L, et al. Research on applicabillity of IMRT dose verification based on Monte Carlo simulation［J］. Chinese Journal of Radiological Medicine and Protection, 2017, 37(5): 384-388.
［11］于海容, 刘洋, 孙静, 等. 放射治疗用胶片剂量测量方法验证［J］. 医疗装备, 2017, 30(18): 45-46.
Yu H R, Liu Y, Sun J, et al. Verification of film dosimetry for radiotherapy［J］. Chinese Journal of Medical Device, 2017, 30(18): 45-46.
［12］张彦立, 龚晓明, 夏渲. UELR-10-10s直线电子加速器剂量学评定［J］. 计量学报, 2011, 32(z1): 54-57.
Zhang Y L, Gong X M, Xia X. Dosimetry Measurements During the Commission of the UELR-10-10s Linear Electron Accelerator［J］. Acta Metrologica Sinica, 2011, 32(z1): 54-57.
［13］张辉, 王坤, 杨元第. 基于医用电子直线加速器的参考辐射装置的初步设计［J］. 计量学报, 2011, 32(z1): 14-17.
Zhang H, Wang K, Yang Y D. The Initial Design of the Reference Radiation Facility Based on the Clinical Linear Accelerator［J］. Acta Metrologica Sinica, 2011, 32(z1): 14-17.
［14］伍海彪, 张帆, 张振朝, 等. 医用加速器射线参数对百分深度剂量影响的蒙特卡罗模拟［J］. 中华放射医学与防护杂志, 2018, 38(2): 145-149.
Wu H B, Zhang F, Zhang Z C, et al. Monte Carlo-based simulation of influence of linear accelerator beam parameter on percentage depth dose［J］. Chinese Journal of Radiological Medicine and Protection, 2018, 38(2): 145-149.
［15］张艺宝, 吴昊, 胡俏俏, 等. 6MV光子束均整与非均整模式蒙特卡罗模型的绝对剂量刻度与输出因子模拟［J］. 中华放射医学与防护杂志, 2017, 37(1): 29-34.
Zhang Y B, Wu H, Hu Q Q, et al. Absolute dose calibration and output factor simulation for flattened and flattening filter-free Monte Carlo model of 6 MV photon beams［J］. Chinese Journal of Radiological Medicine and Protection, 2017, 37(1): 29-34.