Observations of artefacts in the x-ray ptychography method.
Observations of artefacts in the x-ray ptychography method.
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DOI：
10.1364/oe.22.010294
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发表时间：
2014-05
期刊：
影响因子：
3.8
通讯作者：
N. Burdet;G. Morrison;Xiaojing Huang;Xiaowen Shi;J. Clark;Fucai Zhang;M. Civita;R. Harder;I. Robinson
中科院分区：
文献类型：
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作者：
N. Burdet;G. Morrison;Xiaojing Huang;Xiaowen Shi;J. Clark;Fucai Zhang;M. Civita;R. Harder;I. Robinson
利用X射线重叠关联成像技术，对西门子星星测试图形进行了振幅和相位对比度重建。在研究如何使用具有增加的带宽的照明导致图像重建质量的明显改善时，我们发现，该算法的整体距离比例因子的人为变化导致图像中的系统响应，这是用不正确的辐条数量再现的。这种病理是由扫描和检测器上的衍射图案设置的长度尺度之间的冲突来解释的。
X-ray ptychography, a scanning coherent diffraction imaging method, was used to reconstruct images of a "Siemens star" test pattern with amplitude and phase contrast. While studying how the use of illumination with an increased bandwidth results in clear improvements in the quality of image reconstructions, we found that an artificial change in the overall distance scale factor of the algorithm leads to a systematic response in the image, which is reproduced with an incorrect number of spokes. This pathology is explained by the conflict between the length scales set by the scan and by the diffraction patterns on the detector.