大尺寸构件工业CT成像方法

魏东波; 傅健; 龚磊; 姜明

大尺寸构件工业CT成像方法

1.
北京航空航天大学机械工程及自动化学院, 北京 100083
2. 北京大学数学科学学院, 北京 100871

基金项目: 国家自然科学基金资助项目(50575015);北京大学工程研究院科研合作平台资助项目(204042)

详细信息

作者简介:
魏东波(1952-),男,湖北赤壁人,副教授, weidongbo1019@yahoo.com.cn.

中图分类号: TP 391
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- 文章访问数: 2649
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- 被引次数: 0
出版历程
- 收稿日期: 2006-03-29
- 网络出版日期: 2006-12-31

Industrial CT imaging method for large objects

1.
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
2. School of Mathematical Sciences, Peking University, Beijing 100871, China

摘要

摘要: 为解决大尺寸构件快速ICT(Industrial Computed Tomography)成像问题,提出了一种通过检台2次偏置扩大扫描视场的ICT成像方法,并基于三代ICT投影数据存在的冗余特征,推导了它的投影数据重排预处理方法和滤波反投影(FBP,Filter Back-Projection)重建算法.该重排预处理方法建立了扇束投影数据与平行束投影数据间的函数映射关系,可将探测器在2个扫描位置采集的2组不完整扇形射束投影数据重排成一组完整的平行射束投影,从而使后续重建得以进行.计算机仿真结果表明,该方法在重构大尺寸构件图像时,获得了满意的质量.分析表明,在增加一次360°回转扫描情况下,其有效扫描视野达到标准三代ICT方法的2.8倍左右.该方法仅需CT扫描台具备平移和旋转自由度,易于与现有三代ICT兼容,工程实现方便.
- ICT /
- 扫描 /
- 滤波反投影 /
- 扇束 /
- 大尺寸构件
Abstract: An industrial computed tomography(ICT) imaging method to enlarge the field of view was proposed to execute the rapid CT test of large objects. Its projection data rebin pre-processing method and filter back-projection reconstruction algorithm were deduced. The pre-processing method is from the fact that there exists the data redundancy for 3rd scan ICT. It creates the function mapping relationship between fan beam projections and parallel beam projections. This method can rebin the two groups of incomplete fan beam projections acquired by the detector at two positions into one group of complete parallel beam projections to meet the requirement of the reconstruction algorithm. The computer simulation results prove the validity of the proposed method to large objects. Analysis shows that its field of view is 1.8 times larger than that of 3rd scan ICT. This method can be implemented with the table with the transverse movement and the rotation movement and is easy to compatible with 3rd scan ICT without extra hardware requirements.
- ICT /
- scan /
- filter back-projection /
- fan beam /
- large objects

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参考文献(1)

[1] Little F H, Galish A J. Rotate/rotate method and apparatus for computed tomography x-ray inspection of large objects:USA, 5119408 . 1992-06-02 [2] Sivers E A. Use of multiple CT scans to accommodate large objects and stretch dynamic range of detectability[J]. Nuclear Instruments and Methods in Physics Research:Section B,1995, 99:761-764 [3] 庞彦伟,王召巴. 大型试件的X射线CT检测方法[J]. 光学技术,2002,28(2):99-102 Pang Yanwei,Wang Zhaoba.Research of detecting methods of large objects by X-CT[J]. Optical Technique,2002,28(2):99-102(in Chinese) [4] 傅健,路宏年. 一种新颖的ICT扫描方式及其FBP重建算法[J]. 北京航空航天大学学报, 2003, 29(1):9-12 Fu Jian, Lu Hongnian. Novel ICT scan mode and its FBP reconstruction algorithm . Journal of Beijing University of Aeronautics and Astronautics,2003,29(1):9-12(in Chinese) [5] 傅健,路宏年,王宏钧. 锥束准三代三维工业CT成像方法研究[J]. 兵工学报,2005,26(6):776-779 Fu Jian,Lu Hongnian,Wang Hongjun.A study on cone-beam quasi generation III 3D-ICT imaging method[J]. Acta Armamen Tarii,2005,26(6):776-779(in Chinese) [6] Hsieh J,Chao E,Grekowicz B,et al. Novel approach to extend the scanner coverage beyond detector field of view Proceedings of SPIE:The International Society for Optical Engineering.Bellingham:SPIE,2004,5368(1):60-66 [7] Hooper H R,Fallone B G.Sinogram merging to compensate for truncation of projection data in tomotherapy imaging[J].Medical Physics,2002,29(11):2548-2551 [8] Yu Lifeng,Pan Xiaochuan,Pelizzari C A,et al. A new approach for CT image reconstruction with asymmetric configuration Proceedings of SPIE:The International Society for Optical Engineering. Bellingham:SPIE,2003,5032 III:1911-1917 [9] Gregor J,Gleason S S,Paulus M J.Cone beam X-ray computed tomography with an offset detector array Int Conf Image Proc. Barcelona:IEEE,2003:803-806 [10] Fu Jian,Lu Hongnian. Research of large field of view scan mode for industrial CT[J].Chinese Journal of Aeronautics, 2003,16(1):59-64 [11] 傅健,路宏年. 扇束X射线ICT偏置扫描方式及其重构算法[J].光学技术,2003,29(1):115-118 Fu Jian, Lu Hongnian. Bias scan mode for fan beam X-ray ICT and its reconstruction algorithm[J]. Optical Technique, 2003,29(1):115-118(in Chinese) [12] 傅健,路宏年.工业CT半扫描成像技术[J]. 北京航空航天大学学报,2005,31(9):966-969 Fu Jian,Lu Hongnian. Half-scan mode for industrial CT[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005,31(9):966-969(in Chinese) [13] Kak A C,Slaney M. Principles of computerized tomographic imaging[M]. New York:IEEE Press, 1999

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