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Single-shot grating-based x-ray differential phase contrast imaging with a modified analyzer grating

Chinese Physics B 2017年第10期26卷 501-507页

作者：卫晨希吴朝 Faiz Wali 魏文彬鲍园骆荣辉王磊刘刚田扬超 National Synchrotron Radiation Laboratory University of Science and Technology of China Shanghai United Imaging Healthcare Co.Ltd.

X-ray grating interferometer has attracted widely attention in the past years due to its capability in achieving x-ray phase contrast imaging with low brilliance source. However, the widely used phase stepping information extraction method reduces system stability and prolongs data acquisition time by several times compared with conventional x-ray absorption- based imaging. The mechanical stepping can be avoided by using a staggered grating, but at the cost of low vertical spatial resolution. In this paper, employing a modified staggered grating and the angular signal radiography, we proposed a single-shot grating-based x-ray differential phase contrast imaging with decent vertical spatial resolution. The theoretical framework was deduced and proved by numerical experiments. Absorption, phase, and scattering computed tomography can be performed without phase stepping. Therefore, we believe this fast and highly stable imaging method with decent resolution would be widely applied in x-ray grating-based phase contrast imaging.

关键词： x-ray phase contrast imaging single-shot decent resolution staggered grating computed tomography

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Noise analysis of grating-based x-ray differential phase-contrast imaging with angular signal radiography

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Chinese Physics B 2017年第4期26卷 138-143页

作者： Wali Faiz 鲍园高昆吴朝卫晨希昝贵彬朱佩平田扬超 National Synchrotron Radiation Laboratory University of Science and Technology of ChinaHefei 230029China Shanghai United Imaging Healthcare Co.Ltd. Shanghai 201807China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

X-ray phase-contrast imaging is one of the novel techniques,and has potential to enhance image quality and provide the details of inner structures *** this work,we investigate quantitatively signal-to-noise ratio（SNR） of grating-based x-ray phase contrast imaging（GBPCI） system by employing angular signal radiography（ASR）.Moreover,photon statistics and mechanical error that is a major source of noise are investigated in *** show the dependence of SNR on the system parameters and the effects on the extracted absorption,refraction and scattering *** conclusions can be used to optimize the system design for upcoming practical applications in the areas such as material science and biomedical imaging.

关键词： angular signal radiography signal-to-noise ratio photon statistical noise mechanical error

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