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基于微扫描方法的大视野高分辨率同步辐射X射线成像

Synchrotron radiation X-ray imaging with large field of view and high resolution using micro-scanning method.

作者信息

Sun Rui, Wang Yanping, Zhang Jie, Deng Tijian, Yi Qiru, Yu Bei, Huang Mei, Li Gang, Jiang Xiaoming

机构信息

Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China.

University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China.

出版信息

J Synchrotron Radiat. 2022 Sep 1;29(Pt 5):1241-1250. doi: 10.1107/S1600577522007652. Epub 2022 Aug 12.

DOI:10.1107/S1600577522007652
PMID:36073883
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9455207/
Abstract

In synchrotron radiation X-ray imaging, the imaging field of view and spatial resolution are mutually restricted, which makes it impossible to have both a large field of view and high resolution when carrying out experiments. Constructing an oversampled image through the micro-scanning method and using the deconvolution algorithm to eliminate the point spread function introduced by pixel overlap can increase the resolution under a fixed imaging field of view, thereby improving the ratio of the field of view to the spatial resolution. In this paper, numerical simulation and synchrotron radiation experiments are carried out with a different number of micro-scanning steps. In numerical simulation experiments only affected by the image pixel size, as the number of micro-scanning steps increases, the ability of the oversampled image with deconvolution to improve the resolution is stronger. The achievable resolution of the oversampled image with deconvolution is basically the same as that of the sample image. In the synchrotron radiation experiments, the resolution of the oversampled image with deconvolution in the 2 × 2 mode is significantly improved. However, as the number of micro-scanning steps increases, the resolution improvement is limited, or even no longer improved. Finally, by analyzing the results of numerical simulation and synchrotron radiation experiments, three factors (four other factors affecting the resolution besides the camera resolution, translational accuracy of micro-scanning, and the signal-to-noise ratio of projections) affecting the micro-scanning method are proposed and verified by experiments.

摘要

在同步辐射X射线成像中，成像视场与空间分辨率相互制约，导致实验时无法同时具备大视场和高分辨率。通过微扫描方法构建过采样图像，并利用去卷积算法消除像素重叠引入的点扩散函数，可在固定成像视场下提高分辨率，从而提升视场与空间分辨率的比值。本文针对不同微扫描步数进行了数值模拟和同步辐射实验。在仅受图像像素尺寸影响的数值模拟实验中，随着微扫描步数增加，经去卷积的过采样图像提高分辨率的能力更强。经去卷积的过采样图像可达到的分辨率与样本图像基本相同。在同步辐射实验中，2×2模式下经去卷积的过采样图像分辨率显著提高。然而，随着微扫描步数增加，分辨率提升有限，甚至不再提高。最后，通过分析数值模拟和同步辐射实验结果，提出了影响微扫描方法的三个因素（除相机分辨率、微扫描平移精度和投影信噪比外影响分辨率的其他四个因素），并通过实验进行了验证。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/a81182b1044c/s-29-01241-fig15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/1b36d7cfda2e/s-29-01241-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/a283313cce1e/s-29-01241-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/aa41e1db353b/s-29-01241-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/39123c3a37d2/s-29-01241-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/e13a2f93c8a6/s-29-01241-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/250698551a43/s-29-01241-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/4b67cbac362c/s-29-01241-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/40b328d5a6ed/s-29-01241-fig8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/193bf93bc21e/s-29-01241-fig9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/248c9951fa54/s-29-01241-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/20b9ee84e3a7/s-29-01241-fig11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/78545f86d909/s-29-01241-fig12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/4300359da964/s-29-01241-fig13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/1713de138a7a/s-29-01241-fig14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/a81182b1044c/s-29-01241-fig15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/1b36d7cfda2e/s-29-01241-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/a283313cce1e/s-29-01241-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/aa41e1db353b/s-29-01241-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/39123c3a37d2/s-29-01241-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/e13a2f93c8a6/s-29-01241-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/250698551a43/s-29-01241-fig6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/4b67cbac362c/s-29-01241-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/40b328d5a6ed/s-29-01241-fig8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/193bf93bc21e/s-29-01241-fig9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/248c9951fa54/s-29-01241-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/20b9ee84e3a7/s-29-01241-fig11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/78545f86d909/s-29-01241-fig12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/4300359da964/s-29-01241-fig13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/1713de138a7a/s-29-01241-fig14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3415/9455207/a81182b1044c/s-29-01241-fig15.jpg

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