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。
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.
作者
田忠建
余海军
汪粼波
皮真真
刘丰林
Tian Zhongjian;Haijun Yu;Linbo Wang;Zhenzhen Pi;Fenglin Liu(State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China;Key Laboratory of Optoelectronic Technology and Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;Engineering Research Center of Industrial Computed Tomography Nondestructive Testing,Ministry of Education,Chongqing University,Chongqing 400044,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2020年第22期91-100,共10页
Acta Optica Sinica
基金
国家自然科学基金(61471070)
工业CT无损检测教育部工程研究中心开放课题资助。
关键词
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
