光学学报, 2020, 40 (22): 2211002, 网络出版: 2020-10-25
正交直线扫描计算机分层成像研究 下载: 911次
Orthogonal Translation Computed Laminography
成像系统 X射线成像 计算机分层成像 正交直线扫描 图像重建 imaging systems X-ray imaging computed laminography orthogonal translation image reconstruction
摘要
直线扫描计算机分层成像(CL)在扫描运动方向上的成像分辨率较高,但在垂直于扫描运动方向的成像空间分辨率较低。提出一种正交直线扫描CL方法,该方法分别从两个正交方向对检测对象进行直线CL扫描并重建图像,可实现对检测对象两个正交方向的高分辨率成像。建立了正交直线扫描CL方法的几何模型,分析了扫描运动,搭建了实验系统,图像重建采用同步迭代重建(SIRT)算法。仿真和扫描实验结果表明,正交直线扫描CL方法可行,可用于对平板类零部件的无损检测。
Abstract
Parallel translation computed laminography (CT) has higher imaging resolution in the direction of scanning and lower spatial resolution in the direction perpendicular to the scanning direction. We propose an orthogonal translation CL (OTCL) method to perform line scanning and realize high resolution imaging for objects to be detected in two orthogonal directions. A geometric model of the OTCL is established, the scanning motion is analyzed, the experimental system is established, and simultaneous iterations reconstruction (SIRT) algorithm is used to reconstruct CL images. Simulation and experimental results show that the OTCL method is feasible and can be used in the nondestructive testing of flat plate parts.
田忠建, 余海军, 汪粼波, 皮真真, 刘丰林. 正交直线扫描计算机分层成像研究[J]. 光学学报, 2020, 40(22): 2211002. Zhongjian Tian, Haijun Yu, Linbo Wang, Zhenzhen Pi, Fenglin Liu. Orthogonal Translation Computed Laminography[J]. Acta Optica Sinica, 2020, 40(22): 2211002.