Devic Slobodan, Tomic Nada, Soares Christopher G, Podgorsak Ervin B
Medical Physics Department, McGill University Health Centre, Montréal, Québec H3G 1A4, Canada.
Med Phys. 2009 Feb;36(2):429-37. doi: 10.1118/1.3049597.
The authors present a radiochromic film dosimetry protocol for a multicolor channel radiochromic film dosimetry system consisting of the external beam therapy (EBT) model GAFCHROMIC film and the Epson Expression 1680 flat-bed document scanner. Instead of extracting only the red color channel, the authors are using all three color channels in the absorption spectrum of the EBT film to extend the dynamic dose range of the radiochromic film dosimetry system. By optimizing the dose range for each color channel, they obtained a system that has both precision and accuracy below 1.5%, and the optimized ranges are 0-4 Gy for the red channel, 4-50 Gy for the green channel, and above 50 Gy for the blue channel.
作者介绍了一种用于多色通道放射变色薄膜剂量测定系统的放射变色薄膜剂量测定方案，该系统由外照射治疗（EBT）型号的GAFCHROMIC薄膜和爱普生Expression 1680平板文档扫描仪组成。作者并非仅提取红色通道，而是利用EBT薄膜吸收光谱中的所有三个颜色通道来扩展放射变色薄膜剂量测定系统的动态剂量范围。通过优化每个颜色通道的剂量范围，他们获得了一个精度和准确度均低于1.5%的系统，优化后的范围是红色通道为0至4 Gy，绿色通道为4至50 Gy，蓝色通道为50 Gy以上。
