A comprehensive study of the Gafchromic EBT2 radiochromic film. A comparison with EBT
A comprehensive study of the Gafchromic EBT2 radiochromic film. A comparison with EBT
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DOI：
10.1118/1.3512792
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发表时间：
2010-12-01
期刊：
影响因子：
3.8
通讯作者：
Barquero, R.
中科院分区：
文献类型：
--
作者：
Andres, C.;del Castillo, A.;Barquero, R.
目的：放射变色膜已成为评价复杂剂量分布的重要工具。特别是，EBT被科学界接受为参考二维探测器。最近，Gafchromic EBT2已经取代了旧胶片，在精度和处理方面提供了新的改进。方法：本文采用Epson 10000XL平板扫描仪对新型Gafchromic EBT2进行剂量学研究，并在必要时将结果与EBT膜进行比较作为参考。研究了最重要的薄膜特性，如环境光敏感性，三个RGB颜色通道的不同可能性，辐射后发展，高剂量行为，在类似人体的温度下暴露，以及在扫描过程中对取向的依赖。结果：所获得的结果证实了EBT2对环境光的敏感性相当低，并且在2小时内薄膜快速稳定。还发现绿色通道在高达35 Gy的高剂量水平下具有更好的行为，除了红色通道在低于10 Gy的剂量下具有良好的行为。其他特征，如温度无关性和扫描方向依赖性，也已显示。结论：Gafchromic EBT与旧EBT膜一样可用于临床。然而，由于所有新增强的结果，更容易处理，改善了薄膜的行为，以这种方式扩大了放射性致色膜剂量学的潜在应用。(C) 2010年美国医学物理学家协会。(DOI: 10.1118/1.3512792)
Purpose: Radiochromic film has become an important tool to assess complex dose distributions. In particular, EBT was accepted by the scientific community as a reference two-dimensional detector. Recently, Gafchromic EBT2 has replaced old film, providing new improvements in both accuracy and handling.Methods: This work presents a dosimetric study of the new Gafchromic EBT2 using an Epson 10000XL flatbed scanner, also comparing the results with EBT film as reference when necessary. The most important film characteristics have been studied, such as ambient light sensitivity, different possibilities of the three RGB color channels, postirradiation development, high dose behavior, exposition at temperatures similar to the human body, and dependence on orientation during the scanning process.Results: The results obtained confirm a considerably lower sensitivity to ambient light of EBT2, as well as a fast stabilization of the film within 2 h. It has also been found that the green channel has a better behavior at high dose levels up to 35 Gy, in addition to good behavior of the red channel at doses below 10 Gy. Other features, such as temperature independence and scanning orientation dependence, have also been shown.Conclusions: Gafchromic EBT2 can be used for clinical practice in the same way as the old EBT film. However, a much easier handling as the result of all new enhancements improves film behavior, expanding in this way the potential applications of radiochromic film dosimetry. (C) 2010 American Association of Physicists in Medicine. [DOI: 10.1118/1.3512792]