Shuangxi Qi

Institute of Fluid Physics

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Dongbing Liu

Zhejiang Cancer Hospital

Cheng Jinming

Institute of Fluid Physics

Yan Ye

Stamford International University

Weixin Qian

China Academy of Engineering Physics

Weixin Qian

Institute of Fluid Physics

Pengfei Zhu

Shandong University

Lin Zhang

Guangdong Academy of Medical Sciences

Limin Meng

Chinese PLA General Hospital

Yudong Cao

Institute of Fluid Physics

Wanli Wang

Research Institute of Petroleum Exploration and Development

Cooperative Institutions

Institute of Fluid Physics

China Academy of Engineering Physics

Chinese Academy of Sciences

Zhejiang University of Technology

Institute of High Energy Physics

Shandong University

Shanghai Institute of Measurement and Testing Technology

Stamford International University

Jiaxing University

Beijing Academy of Artificial Intelligence

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The influence of spectrum and imaging geometry on propagation-based phase-contrast imaging for micro-focus source

Optik (2015)

Cheng Jinming Yudong Cao Qingguo Yang Shuangxi Qi Yan Ye

Monochromatic color

X-Ray Phase-Contrast Imaging

10.1016/j.ijleo.2015.11.192

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Citations (2)

A new nonlinear reconstruction method based on total variation regularization of neutron penumbral imaging

Review of Scientific Instruments (2011)

Weixin Qian Shuangxi Qi Wanli Wang Cheng Jinming Dongbing Liu

Neutron penumbral imaging is a significant diagnostic technique in laser-driven inertial confinement fusion experiment. It is very important to develop a new reconstruction method to improve the resolution of neutron penumbral imaging. A new nonlinear reconstruction method based on total variation (TV) regularization is proposed in this paper. A TV-norm is used as regularized term to construct a smoothing functional for penumbral image reconstruction in the new method, in this way, the problem of penumbral image reconstruction is transformed to the problem of a functional minimization. In addition, a fixed point iteration scheme is introduced to solve the problem of functional minimization. The numerical experimental results show that, compared to linear reconstruction method based on Wiener filter, the TV regularized nonlinear reconstruction method is beneficial to improve the quality of reconstructed image with better performance of noise smoothing and edge preserving. Meanwhile, it can also obtain the spatial resolution with 5 μm which is higher than the Wiener method.

Smoothing

Regularization

Total variation denoising

10.1063/1.3638463

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In situ areal mass measurement of laser shock-loaded aluminum using point-projection x-ray backlighting

Applied Optics (2022)

Cheng Jinming Shuangxi Qi Dongbing Liu Weixin Qian Lin Zhang

X-ray backlighting is been widely used today in dynamic phenomena observation. By applying proper synchronizing techniques, the in-situ data of the intensity distribution of the fragments in laser-driven shock-loaded aluminum were obtained for a particular moment using x-ray backlighting imaging. The image resolution was better than 40 µm in this context by introducing a pinhole. In order to obtain the areal mass of the fragments, a set of reference Al step wedges with certain thicknesses was employed. Furthermore, a novel, to the best of our knowledge, calibration method is introduced to calibrate the x-ray intensity distribution. It was effective to decrease the non-uniformity influence of the x-ray intensity with this calibration method by simulating a light field. After calibration, the standard deviation of 30 regions of interest reduced to 4.17%. In consequence, the areal mass distribution of the fragments is well quantified. It should be noted that the uncertainty in the areal mass conversion mainly comes from the non-uniformity of the x-ray intensity distribution with about 5% and the measurement uncertainty of the step thicknesses with less than 10%.

Backlight

Intensity

Collimated light

Pinhole (optics)

10.1364/ao.453507

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Generalized Variation Minimization Based Algorithm for Image Reconstruction from Few-Views of Limited Angular in Computed Tomography

Springer proceedings in physics (2024)

Weixin Qian Liangliang Du Shuangxi Qi

Variation (astronomy)

Minification

10.1007/978-3-031-65913-3_11

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