Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (5): 72 doi: 10.1007/s41365-018-0403-3

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Simulation study on characteristics of information extraction in multiple-image radiography

Cui Zhang 1 • Xiao-Dong Pan 1 • Jing-Jie Ding 1 • Hong-Jie Shang 1 • Zhang-Gu Chen 1 • Yong-Fan Pu 1 • Gong-Ping Li 1,2   

  1. 1 School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
    2 Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Lanzhou 730000, China
  • Contact: Gong-Ping Li E-mail:Ligp@lzu.edu.cn
  • Supported by:

    This work was supported by the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Nos. lzujbky- 2016-208 and lzujbky-2016-32) and the Lanzhou University Construction Project for Innovation and Cooperative Education Base.

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Cui Zhang, Xiao-Dong Pan, Jing-Jie Ding, Hong-Jie Shang, Zhang-Gu Chen, Yong-Fan Pu, Gong-Ping Li. Simulation study on characteristics of information extraction in multiple-image radiography.Nuclear Science and Techniques, 2018, 29(5): 72     doi: 10.1007/s41365-018-0403-3

Abstract:

Simulation experiments were performed to investigate the characteristics of information extraction in multiple-image radiography (MIR) based on geometrical optics approximation. Different Poisson noise levels were added to the simulation, and the results show that Poisson noise deteriorates the extraction results, with the degree of refraction[USAXS[absorption. The effects of Poisson noise are negligible when the detector’s photon counts are about 1000 ph/pixel. A wider sampling range allows more accurate extraction results, but a narrower sampling range has a better signal-to-noise ratio for high Poisson noise levels, e.g., PN(10). The sampling interval can be suitably increased with a minor impact on the extraction results for low Poisson noise levels (PN(10000)). The extraction results are incomplete because a portion of the samplerocking curve is beyond the sampling range. This induces artifacts in the images, especially for strong refraction and USAXS signals. The artifacts are not obvious when the refraction angle and standard deviation of the USAXS are smaller than the sampling range by an order of magnitude. In general, the absorption barely affects the extraction results. However, additional Poisson noise will be generated when the sample is made of high-Z elements or has a large size due to the strong absorption. Here, the extraction results will deteriorate, and additional exposure time is required. This simulation provides important details on practical applications of MIR, with improvements in information extraction.

Key words: X-ray imaging, Phase contrast, Rocking curve, Multiple-image radiography