Reconstruction method for grating-based x-ray phase-contrast images without knowledge of the grating positions
Reconstruction method for grating-based x-ray phase-contrast images without knowledge of the grating positions
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DOI：
10.1088/1748-0221/10/12/p12017
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发表时间：
2015-12
影响因子：
1.3
通讯作者：
G. Pelzer;J. Rieger;C. Hauke;F. Horn;T. Michel;M. Seifert;G. Anton
中科院分区：
文献类型：
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作者：
G. Pelzer;J. Rieger;C. Hauke;F. Horn;T. Michel;M. Seifert;G. Anton
为了使用Talbot-Lau干涉仪检索X射线的相位信息，光栅位置的知识是强制性的。将干涉仪技术从实验室转移到传统的X射线成像系统，这一要求不再得到保证。这是由于耦合到干涉仪中的失真和振动。因此，我们应用主成分分析Talbot-Lau X射线相衬数据。在实验中，我们比较了这种替代方法的图像重建的传统程序。结果表明，主成分分析方法对不完美的相位步进数据具有上级鲁棒性，而且该方法还可以从随机分布的相位步进位置重建X射线相衬图像。
To retrieve the phase information of x-rays using a Talbot-Lau interferometer, the knowledge of the grating positions is mandatory. Transferring the interferometer technique from the laboratory to a conventional x-ray imaging system, this requirement is no longer guaranteed. This is due to distortions and vibrations which are coupled into the interferometer. Therefore, we applied a principal-component analysis to Talbot-Lau x-ray phase-contrast data. In experiments we compared this alternative approach for image reconstruction to the conventional procedure. As a result, a superior robustness of the principal-component analysis against imperfect phase-stepping data was found. Furthermore, using the proposed method, the reconstruction of x-ray phase-contrast images from randomly distributed phase-step positions is possible.