| 管壁长弦投影数据截断问题的迭代重建算法 |
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| 引用本文： | 刘宝东,曾理,李林升.管壁长弦投影数据截断问题的迭代重建算法[J].仪器仪表学报,2011,32(1). |
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| 作者姓名： | 刘宝东 曾理 李林升 |
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| 作者单位： | 1. 重庆大学光电技术及系统教育部重点实验室ICT研究中心,重庆,400044;重庆大学光电工程学院,重庆,400044
2. 重庆大学光电技术及系统教育部重点实验室ICT研究中心,重庆,400044;重庆大学数理学院,重庆,400044 |
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| 基金项目： | 国家自然科学基金，重庆大学研究生科技创新基金 |
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| 摘 要： | 计算机断层成像(CT)可用于管状物的无损检测.当管壁较厚而射线能量较低时,会产生管壁长弦投影数据截断问题.联合代数重建算法(SART)易于处理投影数据截断问题,但是该方法用于管壁长弦投影数据截断问题后,其重建结果仍存在灰度渐变的伪影.为了提高重建图像的质量,将基于Chan-Vese (C-V)活动轮廓模型的重建图像分段常数化修正引入到SART算法中,得到了带分段常数化修正的SART重建算法(PCC-SART).实验结果表明,该算法收敛速度快、精度高、稳定性好.
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| 关 键 词： | 计算机断层成像 投影数据截断 联合代数重建 分段常数修正 |
Iterative reconstruction algorithm of projection data truncation problem caused by the long chords of pipe wall |
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| Liu Baodong,Zeng Li,Li Linsheng.Iterative reconstruction algorithm of projection data truncation problem caused by the long chords of pipe wall[J].Chinese Journal of Scientific Instrument,2011,32(1). |
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| Authors: | Liu Baodong Zeng Li Li Linsheng |
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| Affiliation: | Liu Baodong1,2,Zeng Li1,3,Li Linsheng1,2(1 ICT Research Center,Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China,Chongqing University,Chongqing 400044,China,2 College of Optoelectronic Engineering,3 College of Mathematics and Physics,China) |
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| Abstract: | Computed tomography(CT) can be used in nondestructive testing of pipe type objects.Truncation problem arises when the pipe wall is too thick and the energy of X-rays is not strong enough.Simultaneous algebraic reconstruction technique(SART) is suitable for dealing with common projection data truncation problem.However,when SART is used in dealing with the truncation problem caused by long chord of pipe,the reconstruction results still contain gray changing artifacts.In order to improve the quality of recons... |
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| Keywords: | computed tomography projection data truncation simultaneous algebraic reconstruction technique piecewise-constant correction |
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