NDLI: Differential phase-contrast tomosynthetic experimental system with weakly coherent hard X-rays

Content Provider	IEEE Xplore Digital Library
Author	Zhentian Wang, Kejun Kang, Zhifeng Huang, Li Zhang, Zhiqiang Chen, Fei Ding, Qiaoguang Fang,
Copyright Year	2008
Description	Author affiliation: Department of Engineering Physics, Tsinghua University, Beijing, China, 100084 (Zhentian Wang,; Kejun Kang,; Zhifeng Huang,; Li Zhang,; Zhiqiang Chen,; Fei Ding,; Qiaoguang Fang,)
Abstract	Hard X-ray phase-contrast imaging can provide high sensitivity of weakly absorbing low-Z objects in medical and biological fields. Grating-based differential phase-contrast (DPC) method which relies on Talbot self-imaging effect have been paid more attention because it can work with conventional X-ray tube and show great potential for clinic use. Meanwhile tomosynthesis as a 3D reconstruction method is especially useful in mammography where low does is necessary. In this paper, an phase-contrast tomosynthetic experimental system is implemented based on the differential phase contrast imaging method according to moiré deflectometry (named MD-DPC method) with weakly coherent hard X-rays. The source grating of former grating-based method can perhaps be removed and the energy utilization efficiency of the X-ray tube is increased. The effectiveness of MD-DPC method is proved by actual experiments. In our phase-contrast tomosynthetic experimental system, the x-ray tube and the detector is stationary while the sample is rotated on a rotation stage, which is equivalent to conventional linear tomosynthesis. However, for phase contrast image, the refraction-angle is the line integral of differentials of refractive index decrement in the sample along the beam path whose vector direction is vary as the tomosynthetic projection direction changes, so refraction-angle projections can’t be simply added up like scalar quantities as in conventional tomosynthesis. A mapping method is adopted here to map each refraction-angle projection to the same direction and then refraction-angle tomosynthetic images can be implemented by adopting the shift-and-add approach. Our experimental system is validated and phase-contrast tomosynthesis based MD-DPC would be considered as a promising imaging method for mammography to enhance the contrast of early cancer tissues in the near future.
Starting Page	3889
Ending Page	3891
File Size	4539564
Page Count	3
File Format	PDF
ISBN	9781424427147
ISSN	10957863
DOI	10.1109/NSSMIC.2008.4774132
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-19
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gratings Optical imaging Mammography Biomedical imaging Reconstruction algorithms Phase detection X-ray detection X-ray detectors Refractive index Vectors
Content Type	Text
Resource Type	Article

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