| 一阶相衬CT重建算法的最新进展 |
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| 引用本文： | 方侨光,张丽,黄志峰,陈志强.一阶相衬CT重建算法的最新进展[J].CT理论与应用研究,2008,17(4):23-31. |
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| 作者姓名： | 方侨光 张丽 黄志峰 陈志强 |
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| 作者单位： | [1]清华大学工程物理系,北京100084 [2]清华大学粒子技术与辐射成像教育部重点实验室,北京100084 |
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| 基金项目： | 国家自然科学基金（10575059,30770618）;国家自然科学基金新世纪优秀人才支持计划资助. |
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| 摘 要： | 本文简要地解释了衍射增强成像方法和光栅相衬成像方法的物理原理，详细地介绍了以这两种成像方法为基础的一阶相衬CT的物理模型及其重建算法的最新进展，着重分析这些重建算法的思路、特点和性能。这些重建算法基于相衬成像的物理原理，能够从一阶投影数据出发，直接重建样品内部的折射率分布，从而得到了弱吸收物质的高衬度CT图像。
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| 关 键 词： | 一阶相衬CT 衍射增强成像 光栅相衬成像 |
Review on Reconstruction Algorithms for Differential Phase-Contrast Computed Tomography |
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| Institution: | FANG Qiao-guang, ZHANG Li, HUANG Zhi-feng, Chen Zhi-qiang(a. Department of Engineering Physics, Tsinghua University; b. Key Laboratory of Particle ＆ Radiation Imaging (Tsinghua University), Ministry of Education, Beijing, 100084, China) |
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| Abstract: | Based on the principles of diffraction enhanced imaging （DEI） and grating-based phase-contrast imaging, the reconstruction algorithms for differential phase-contrast CT （DPC-CT） are discussed, including the latest developments, the main ideas and their properties. These algorithms are combination between the physics principles of phase-contrast imaging and conventional CT reconstruction theories, which can reconstruct the distribution of refractive index decrement in the sample from differential projection data directly, showing the interior structure of the low-Z weakly absorbing materials. |
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| Keywords: | differential phase-contrast CT diffraction enhanced imaging grating-based phase-contrast imaging |
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