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单光栅相衬成像莫尔伪影的理论分析与消除

Theoretical Analysis and Elimination of Moiré Artifacts Based on Single Grating Phase-Contrast Imaging

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摘要

与传统相衬成像方法相比,基于傅里叶变换的X射线单光栅相衬成像技术具有辐射剂量低、成像速度快等优势,在材料、医疗等领域具有广阔的应用前景。物体频谱信息的获取是利用该技术恢复相位的关键步骤,但其提取过程容易受到莫尔伪影的影响而导致成像质量下降,限制了该方法的发展应用。针对上述问题,基于莫尔伪影的理论分析和成像系统的结构特征,提出了旋转光栅和调节光栅投影频率两种方案来消除伪影,并在实验上成功验证了它们的可行性,为X射线单光栅相衬成像的推广应用提供了参考。

Abstract

Compared with traditional phase-contrast imaging methods, the X-ray single grating phase-contrast imaging based on Fourier transform has the advantages of low radiation dose and fast imaging speed, and has a broad application prospect in the fields of materials and medical treatment. The extraction of object spectral information is a key step to recover the phase using this technique, but the extraction process is easily affected by Moiré artifacts, which leads to the degradation of the imaging quality and in turn limits the development and application of this method. In view of the above problems, based on the theoretical analysis of Moiré artifacts and the structural characteristics of the imaging system, two schemes by rotating grating and adjusting the projection frequency of grating are proposed to eliminate the artifacts, and their feasibilities are verified successfully in experiments, providing a reference for the promotion and application of X-ray single grating phase-contrast imaging.

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中图分类号:O434.1

DOI:10.3788/AOS202040.0807001

所属栏目:傅里叶光学与信号处理

基金项目:国家自然科学基金、广东省基础与应用基础研究基金、深圳市科技计划项目;

收稿日期:2019-12-19

修改稿日期:2020-01-06

网络出版日期:2020-04-01

作者单位    点击查看

蒋俊:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060
杨君:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060
宗方轲:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060
吴浩:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060
罗琨皓:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060
郭金川:深圳大学物理与光电工程学院光电子器件与系统教育部/广东省重点实验室, 广东 深圳 518060

联系人作者:宗方轲(zongfk@szu.edu.cn); 郭金川(jcguo@szu.edu.cn);

备注:国家自然科学基金、广东省基础与应用基础研究基金、深圳市科技计划项目;

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引用该论文

Jiang Jun,Yang Jun,Zong Fangke,Wu Hao,Luo Kunhao,Guo Jinchuan. Theoretical Analysis and Elimination of Moiré Artifacts Based on Single Grating Phase-Contrast Imaging[J]. Acta Optica Sinica, 2020, 40(8): 0807001

蒋俊,杨君,宗方轲,吴浩,罗琨皓,郭金川. 单光栅相衬成像莫尔伪影的理论分析与消除[J]. 光学学报, 2020, 40(8): 0807001

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