转台单侧多次偏置的旋转扫描模式的重建算法
Reconstruction Algorithm for Unilateral Off-Centered Rotation Translation Multi-Scans
摘 要
在用短的线阵探测器检测大尺寸物体时, 人们提出了多种扫描模式, 以扩大扫描视野, 其中RT(rotation-translation), 即旋转加平移扫描模式在工程上较为实用。针对CT转台单侧多次偏置的RT扫描模式, 提出了反投影滤波型的重建算法。该算法可以直接重建CT图像, 避免了已有算法所需要的数据重排, 因而提高了计算效率和图像空间分辨力, 使图像重建所需的投影数据减少约一半, 从而在相同的旋转和平移次数下有效地扩大了扫描视野。实际CT扫描数据验证了重建算法的正确性。
RT扫描模式
转台偏置
扫描视野
反投影滤波
Reconstruction algorithm
RT scanning mode
Turntable off-centered
Field-of-view
Backprojection-filtration
Abstract
In order to inspect large objects using short linear-detector array, several kinds of CT multi-scan modes have been developed, of which RT (rotation-translation) scan mode is practical in engineering. In this paper, we propose a backprojection-filtration(BPF)-based reconstruction algorithm for unilateral off-centered RT multi-scans. The proposed algorithm can reconstruct CT image directly, without data rebinning process which was introduced in the existing algorithms. Hence it is of high computational efficiency and image spatial resolution. In addition, the projection data required in the image reconstruction are nearly half reduced. As a consequence, the field-of-view is enlarged under the same times of rotation and translation. The validity of the proposed algorithm is verified by the real CT data.
中图分类号 TP391 TG115.28
所属栏目 科研成果与学术交流
基金项目 国家自然科学基金资助项目(60472071, 60532080); 北京市自然科学基金资助项目(4051002)
收稿日期 2007/12/5
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备注陈明(1979-), 女, 博士, 研究方向为检测成像与图像处理。
引用该论文: CHEN Ming,ZHANG Hui-Tao,CHEN De-Feng,ZHANG Peng. Reconstruction Algorithm for Unilateral Off-Centered Rotation Translation Multi-Scans[J]. Nondestructive Testing, 2009, 31(1): 29～34
陈明,张慧滔,陈德峰,张朋. 转台单侧多次偏置的旋转扫描模式的重建算法[J]. 无损检测, 2009, 31(1): 29～34
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【3】孙艳勤.工业CT的几个应用问题研究[D].北京: 首都师范大学,2006.
【4】赵 飞,路宏年,孙翠丽.一种新的二维CT扫描方式及其重建算法[J].光学技术,2006,32(2):812-817.
【5】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,1995,B(99):761-764.
【6】Sivers E A, Snyder S A, Holloway D, et al. CT multiscan: using small area detectors to image large components[J]. Journal of Engineering for Gas Turbines and Power,1996,118(4):711-716.
【7】Leng S, Zhuang T L, Nett B E, et al. Exact fan-beam image reconstruction algorithm for truncated projection data acquired from an asymmetric half-size detector[J]. Phys Med Biol,2005,50(8):1805-1820.
【8】Li L, Chen Z Q, Zhang L, et al. A new cone-beam X-ray CT system with a reduced size planar detector[J]. High Energy Physics and Nuclear Physics,2006,30(8):812-817.
【9】Zou Y, Pan X. Exact image reconstruction on PI-lines from minimum data in helical cone-beam CT[J]. Phys Med Biol,2004,49(6):941-959.
【10】Noo F, Clackdoyle R, Pack J D. A two-step Hilbert transform method for 2D image reconstruction[J]. Phys. Med. Biol,2004,49(17):3903-3923.
【11】Mikhlin S G. Integral equations and their applications to certain problems in mechanics[M]. Mathematical Physics and Technology, New York: Pergamon,1957.
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