School of Physics, The University of Sydney, NSW 2006, Australia.
Phys Med Biol. 2011 Sep 21;56(18):5805-21. doi: 10.1088/0031-9155/56/18/003. Epub 2011 Aug 16.
In scintillation dosimetry, a Cerenkov background signal is generated when a conventional fibre optic is exposed to radiation produced by a megavoltage linear accelerator. Three methods of measuring dose in the presence of Cerenkov background are compared. In the first method, a second background fibre is used to estimate the Cerenkov signal in the signal fibre. In the second method, a colour camera is used to measure the combined scintillation and Cerenkov light in two wavelength ranges and a mathematical process is used to extract the scintillation signal. In the third method, a hollow air core light guide is used to carry the scintillation signal through the primary radiation field. In this paper, the strengths and weaknesses of each dosimetry system are identified and recommendations for the optimum method for common clinical dosimetry situations are made.
在闪烁剂量学中，当传统光纤暴露于兆伏直线加速器产生的辐射下时，会产生切伦科夫背景信号。本文比较了三种在存在切伦科夫背景的情况下测量剂量的方法。第一种方法使用第二根背景光纤来估计信号光纤中的切伦科夫信号。第二种方法使用彩色相机测量两个波长范围内的闪烁和切伦科夫光的总和，并使用数学过程提取闪烁信号。第三种方法使用空心空气芯光导将闪烁信号传输穿过主辐射场。本文确定了每个剂量测量系统的优缺点，并针对常见临床剂量测量情况提出了最佳方法的建议。
