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Characterization of the Cherenkov scatter function for use in superficial dose measurement from external beam radiation treatments

机译:Cherenkov散射函数的特征,用于通过外部束辐射治疗进行表面剂量测量

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Cherenkov light is created in clinical applications involving high-energy radiation such as in radiation therapy. Due to improvements in camera sensitivity, we are now able to detect and measure Cherenkov light created during radiation therapy using linear accelerators (linacs). However, no method currently exists for using Cherenkov light to estimate the absolute radiation dose delivered to irradiated tissues. We have developed a technique to perform dosimetry with images of Cherenkov emission using deconvolution imaging techniques. The deconvolu-tion technique relies upon the Cherenkov Scatter Function (CSF), a function that describes the scattering of Cherenkov light as it is generated by the treatment photons and propagated through tissue to the surface of the skin. In this study, the CSF was generated through Monte Carlo for 6 MV, 10 MV, and 18 MV photon beams in light, medium, dark skin, and optical tissue phantom materials. Functional dependence of on incident treatment beam angle is shown. The CSFs generated are parameterized using a double-Gaussian distribution and fit coefficients are given. Basic formulation of the deconvolution imaging equation is given to show the relationship of the CSF to x-ray beam flux.
机译:Cherenkov光是在涉及高能辐射的临床应用(例如放射治疗)中产生的。由于相机灵敏度的提高,我们现在能够使用线性加速器(直线加速器)检测和测量放射治疗期间产生的Cherenkov光。然而,目前不存在使用切伦科夫光来估计递送至被照射组织的绝对辐射剂量的方法。我们已经开发出一种使用去卷积成像技术对Cherenkov发射图像进行剂量测定的技术。去卷积技术依赖于Cherenkov散射函数(CSF),该函数描述了由治疗光子产生并通过组织传播到皮肤表面的Cherenkov光的散射。在这项研究中,CSF是通过Monte Carlo在浅色,中等,深色皮肤和光学组织体模材料中产生的6 MV,10 MV和18 MV光子束产生的。显示了入射治疗光束角度的功能依赖性。使用双高斯分布对生成的CSF进行参数化,并给出拟合系数。给出了反卷积成像方程的基本公式,以显示CSF与X射线束通量的关系。

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