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。
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 Moiréartifacts,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 Moiréartifacts 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.
作者
蒋俊
杨君
宗方轲
吴浩
罗琨皓
郭金川
Jiang Jun;Yang Jun;Zong Fangke;Wu Hao;Luo Kunhao;Guo Jinchuan(Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2020年第8期24-30,共7页
Acta Optica Sinica
基金
国家自然科学基金(11674232)
广东省基础与应用基础研究基金(2019A1515011785)
深圳市科技计划项目(JCYJ20170818141616714)。
关键词
傅里叶光学
X射线光学
单光栅相衬成像
莫尔伪影
光栅旋转
投影频率
Fourier optics
X-ray optics
single grating phase-contrast imaging
Moiréartifacts
grating rotation
projection frequency
