Optical Computed Tomography for Polymer Gel Dosimetry
Optical Computed Tomography for Polymer Gel Dosimetry
复制标题
用于聚合物凝胶剂量测定的光学计算机断层扫描
DOI：
10.11323/jjmp.37.2_111
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
原 敏
中科院分区：
文献类型：
--
作者：
川村 拓;高梨 宇宙;嶋田 芳和;佐藤 裕一;阿部 慎司;原 敏
本文介绍了一种用于聚合物凝胶剂量测量的光学计算机断层扫描（OCT），重点介绍了我们最近建造的两个系统。第一个OCT系统被归类为第一代系统，包括单个He-Ne激光器、光电二极管和用于移动和转动凝胶剂量计的机械载物台。每个角度的投影数据是从转动的凝胶剂量计获得的。在该系统中，重建图像是使用滤波反投影（FBP）方法从投影数据。第二个OCT系统是利用光板和相机检测器的2D-OCT扫描仪。从扫描图像重建的光密度和辐射剂量之间的剂量-响应关系与使用磁共振成像获得的剂量-响应关系相当。尽管由于光的反射和折射等原因造成的图像伪影还有很大的改善空间，但OCT作为快速、高分辨率、高精度的评价工具，有望成为未来聚合物凝胶剂量学的一种模式。
This article describes an optical computed tomography (OCT) for polymer gel dosimetry, focusing on two systems recently constructed by us. The first OCT system, which is categorized as a first-generation system, comprised a single He-Ne laser, photodiode, and mechanical stages for moving and turning gel dosimeter. Projection data per angle are acquired from turned gel dosimeter. In this system, the reconstructed image is obtained using filtered back-projection (FBP) method from projection data. The second OCT system is a 2D-OCT scanner that utilizes a light panel and a camera detector. The dose-response relationship between the optical density and radiation dose reconstructed from the scanning images is comparable to that obtained using magnetic resonance imaging. Although there is much room for improvement in the image artifacts due to reflection and refraction of light and so on, OCT is expected as a modality for the future polymer gel dosimetry as the rapid, high-resolution, highly accurate evaluation tool.