A new method of image reconstruction with high resolution in x-ray coded aperture imaging

Jiasheng Hu; Lihong Cheng; Xu Wu; Yi Sun; Yuhong Bai

doi:10.1117/12.614721

10 September 2005 A new method of image reconstruction with high resolution in x-ray coded aperture imaging

Jiasheng Hu, Lihong Cheng, Xu Wu, Yi Sun, Yuhong Bai

Proceedings Volume 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II; 591818 (2005) https://doi.org/10.1117/12.614721
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

In the processing diagnosis of the inertia confinement fusion (ICF), the ring coded aperture imaging technique is applied in order to gain high space and time resolutions simultaneously. The key of acquiring high spatial resolution is how to obtain a point spread function of an imaging system. The common method is the firsthand projection method which is an approximate one. The x-ray diffraction effect is neglected in the method, so the resolution of reconstructed image is decreased. We have derived the point spread function (PSF) of the ring coded aperture from scalar diffraction theory. And the Wiener filter is fabricated on the basis of the PSF. In National Key Laboratory of Laser Fusion, at China Academy of Engineering Physics, the imaging experiment on the diagnosis of ICF is completed using the ring coded aperture plate with inner diameter d₁ = 250μm and outer diameter d₂ = 260μm .The obtained coded image is processed by the Wiener filter which diffractive effect is considered. The processed results have shown that resolution and modulation contrast of acquired image are evidently better than the results obtained by the firsthand projection method.

Citation Download Citation

Jiasheng Hu, Lihong Cheng, Xu Wu, Yi Sun, and Yuhong Bai "A new method of image reconstruction with high resolution in x-ray coded aperture imaging", Proc. SPIE 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II, 591818 (10 September 2005); https://doi.org/10.1117/12.614721

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