In this paper, we propose a novel radiochromic film (RCF)-based computed tomography (CT) dosimetry method, which is different from the method based on CT dose index. RCF dosimetry using Gafchromic QA2 films was performed using two lengths of film-folding phantoms. The phantom was exposed to X-ray CT through a single scan, while the RCF was sandwiched between the phantoms. We analysed the dose profile curve in two directions to investigate the dose distribution. We observed a difference in the dose distribution as the phantom size changed. Our results contradict with the results of previous studies such as Monte Carlo simulation or direct measurement. The ability to visually evaluate 2D dose distributions is an advantage of RCF dosimetry over other methods. This research investigated the ability of 2D X-ray CT dose evaluation using RCF and film-folding phantom.

中文翻译：

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使用放射变色胶片和胶片折叠体模的 X 射线 CT 剂量评估方法的概念

在本文中，我们提出了一种新的基于放射变色胶片 (RCF) 的计算机断层扫描 (CT) 剂量测定方法，该方法不同于基于 CT 剂量指数的方法。使用两种长度的薄膜折叠模型进行使用 Gafchromic QA2 薄膜的 RCF 剂量测定。通过单次扫描将模型暴露在 X 射线 CT 下，而 RCF 夹在模型之间。我们从两个方向分析了剂量分布曲线以研究剂量分布。我们观察到随着体模大小的变化，剂量分布的差异。我们的结果与以前的研究结果相矛盾，例如蒙特卡罗模拟或直接测量。视觉评估 2D 剂量分布的能力是 RCF 剂量学优于其他方法的优势。