中国物理B ›› 2014, Vol. 23 ›› Issue (4): 48701-048701.doi: 10.1088/1674-1056/23/4/048701

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Improvement and error analysis of quantitative information extraction in diffraction-enhanced imaging

杨浩, 轩瑞娇, 胡春红, 段敬豪   

  1. College of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China
  • 收稿日期:2013-05-21 修回日期:2013-08-24 出版日期:2014-04-15 发布日期:2014-04-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 30900333 and 81371549) and the WBE Liver Fibrosis Foundation, China (Grant No. CFHPC20131033).

Improvement and error analysis of quantitative information extraction in diffraction-enhanced imaging

Yang Hao (杨浩), Xuan Rui-Jiao (轩瑞娇), Hu Chun-Hong (胡春红), Duan Jing-Hao (段敬豪)   

  1. College of Biomedical Engineering, Tianjin Medical University, Tianjin 300070, China
  • Received:2013-05-21 Revised:2013-08-24 Online:2014-04-15 Published:2014-04-15
  • Contact: Hu Chun-Hong E-mail:chunhong_hu@hotmail.com
  • About author:87.59.-e; 87.64.mh; 42.30.Rx; 41.60.Ap
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 30900333 and 81371549) and the WBE Liver Fibrosis Foundation, China (Grant No. CFHPC20131033).

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摘要： Diffraction-enhanced imaging (DEI) is a powerful phase-sensitive technique that provides higher spatial resolution and supercontrast of weakly absorbing objects than conventional radiography. It derives contrast from the X-ray absorption, refraction, and ultra-small-angle X-ray scattering (USAXS) properties of an object. The separation of different-contrast contributions from images is an important issue for the potential application of DEI. In this paper, an improved DEI (IDEI) method is proposed based on the Gaussian curve fitting of the rocking curve (RC). Utilizing only three input images, the IDEI method can accurately separate the absorption, refraction, and USAXS contrasts produced by the object. The IDEI method can therefore be viewed as an improvement to the extended DEI (EDEI) method. In contrast, the IDEI method can circumvent the limitations of the EDEI method well since it does not impose a Taylor approximation on the RC. Additionally, analysis of the IDEI model errors is performed to further investigate the factors that lead to the image artifacts, and finally validation studies are conducted using computer simulation and synchrotron experimental data.

关键词: X-ray imaging, phase contrast, phase retrieval, synchrotron radiation

Abstract: Diffraction-enhanced imaging (DEI) is a powerful phase-sensitive technique that provides higher spatial resolution and supercontrast of weakly absorbing objects than conventional radiography. It derives contrast from the X-ray absorption, refraction, and ultra-small-angle X-ray scattering (USAXS) properties of an object. The separation of different-contrast contributions from images is an important issue for the potential application of DEI. In this paper, an improved DEI (IDEI) method is proposed based on the Gaussian curve fitting of the rocking curve (RC). Utilizing only three input images, the IDEI method can accurately separate the absorption, refraction, and USAXS contrasts produced by the object. The IDEI method can therefore be viewed as an improvement to the extended DEI (EDEI) method. In contrast, the IDEI method can circumvent the limitations of the EDEI method well since it does not impose a Taylor approximation on the RC. Additionally, analysis of the IDEI model errors is performed to further investigate the factors that lead to the image artifacts, and finally validation studies are conducted using computer simulation and synchrotron experimental data.

Key words: X-ray imaging, phase contrast, phase retrieval, synchrotron radiation

中图分类号:  (X-ray imaging)

  • 87.59.-e
87.64.mh (Phase contrast and DIC) 42.30.Rx (Phase retrieval) 41.60.Ap (Synchrotron radiation)