| 虚拟焦点的超分辨重建方法 |
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| 引用本文： | 张慧滔,于平,赵星,张朋.虚拟焦点的超分辨重建方法[J].无损检测,2010(5):332-337. |
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| 作者姓名： | 张慧滔 于平 赵星 张朋 |
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| 作者单位： | [1]中国科学院高能物理研究所,北京100049 [2]首都师范大学检测成像实验室,北京100048 [3]华北电力大学科技学院,保定071051 |
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| 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） |
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| 摘 要： | 工业计算机断层成像的分辨率一直是人们关注的焦点。针对空间分辨率由焦点大小主宰的CT系统,提出了一种虚拟焦点的超分辨图像重建方法。该方法是将实际焦点的强度分布近似看作两个虚拟焦点的强度分布,再将虚拟焦点近似成理想的点,利用插值代数重建算法的思想,在两个虚拟焦点下做正投影计算估计值和残差,根据像素对每个探测器单元的贡献对像素进行修正。试验证明,改进的插值代数重建算法可以有效地减少由焦点造成的模糊。
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| 关 键 词： | 工业计算机层析成像 超分辨率 图像重建 虚拟焦点 |
A Virtual-Focal-Spot-Based Method for High-Resolution Image Reconstruction on X-ray ICT |
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| ZHANG Hui-Tao,YU Ping,ZHAO Xing,ZHANG Peng.A Virtual-Focal-Spot-Based Method for High-Resolution Image Reconstruction on X-ray ICT[J].Nondestructive Testing,2010(5):332-337. |
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| Authors: | ZHANG Hui-Tao YU Ping ZHAO Xing ZHANG Peng |
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| Affiliation: | 1.Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China; 2.Computer Tomography Laboratory,Capital Normal University,Beijing 100048,China; 3.College of Science and Technology,North China Electric Power University,Baoding 071051,China) |
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| Abstract: | The spatial resolution is one of the key performance parameters of an industry computed tomography （ICT） device.A virtual-focal-spot-based method for high-resolution image reconstruction was proposed.The actual focal spot of X-ray tube into two virtual focal spots was decomposed so that the accumulation of the weighted distributions of the virtual focal spots was approximate to the distribution of the actual focal spot of X-ray tube. Thus,a datum detected by a detector cell could be thought of as the combined contribution from two virtual focal spots.Then high-resolution image by using the improved interpolative algebraic reconstruction technique（IIART） was reconstructed.The validity of the proposed method is verified by numerical experiments. |
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| Keywords: | Industry computed tomography High-resolution Image reconstruction Virtual focal spot |
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