Synchrotron radiation X-ray in-line phase-contrast imaging with highly symmetric source

doi:10.1360/N972016-00905

	Synchrotron radiation X-ray in-line phase-contrast imaging with highly symmetric source
	Zhang, Jie ; Wang, Yanping; Chen, Yu ; Jia, Quanjie; Jiang, Xiaoming; Li G(黎刚); Zhang J(张杰); Yi QR(易栖如); Wang YP(王艳萍); Chen Y(陈雨)
刊名	Chinese Science Bulletin科学通报
	2017
卷号	62 期号:22 页码:2544-2552
ISSN号	0023-074X
DOI	10.1360/N972016-00905
其他题名	高对称度光源的同步辐射X射线同轴相衬成像
文献子类	Article
英文摘要	In available synchrotron radiation facilities all over the world, the size of electron beam bunch has distinct difference between the horizontal direction and the vertical direction at the cross section vertical to electron moving direction. It will cause low symmetry of source size in horizontal and vertical directions, and result in big difference in the spacial resolution and phase contrast between these two directions in synchrotron radiation X-ray in-line phase contrast imaging. The superior resolution and phase contrast of one direction will couple with the inferior ones of the other direction in actual object imaging, this interaction will degrade both spacial resolution and phase contrast of the whole image and lead to poor image quality. In this paper, a four-knife white beam slit is used in Beijing synchrotron radiation facility (BSRF) 4W1A beamline to adjust source size in horizontal and vertical directions and restrict the point spread function (PSF) of source, the source size is limited from 1.23 mm (horizontal)×0.46 mm (vertical) to 0.35 mm×0.35 mm. By this way, a highly symmetric effective X-ray source is obtained. The symmetry of source size is improved from 2.7 to about 1. Although the total X-ray flux loses 99.95%, the X-ray flux density is only reduced to 22%. It because total flux is taken account of the expanded spot size due to divergence, while flux density is mainly related to effective source size, which is limited not severely as expanded spot size by white beam slit. The flux density reduction by this method is not a critical defect in high resolution X-ray phase contrast imaging and can be improved by other ways. The polyamide fiber net is imaged using X-ray in-line phase contrast imaging at 4W1A, BSRF. Diameter of fiber is about 50 microns, X-ray energy is 13 keV, the effective pixel size is 0.325 micron, the experiment images are obtained at object-to-detector distances of 4, 10, 16, 36, 100, 200 and 300 mm with source-to-object distance of about 43 m. The results show that when source size in horizontal direction is limited from 1.23 to 0.35 mm (symmetry of source size is about 1 at this condition), the maximal phase contrast of image is advanced from 0.057 to 0.35. It means the density sensitivity is promoted about 5 times than in ordinary source size conditions. The spacial resolutions in different source size symmetry conditions are also primary analyzed based on Rayleigh criterion. The result shows that spacial resolution can be improved notably in horizontal direction by limiting horizontal source size to a nearly symmetric source size condition. Our work demonstrates that the spacial resolution and phase contrast can be promoted at the same level by source size symmetry improved, which markedly improved the imaging quality in synchrotron radiation X-ray in-line phase-contrast imaging. It will have great benefit to high-resolution X-ray in-line phase contrast imaging. The reasons of these improvements are analyzed and developments in future are also discussed. © 2017, Science Press. All right reserved.
电子版国际标准刊号	2095-9419
语种	中文
CSCD记录号	CSCD:6087180
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284234]
专题	中国科学院高能物理研究所
作者单位	1.Beijing Advanced Sciences and Innovation Center of Chinese Academy of Sciences, Beijing; 101407, China 2.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; 100049, China;
推荐引用方式 GB/T 7714	Zhang, Jie,Wang, Yanping,Chen, Yu,et al. Synchrotron radiation X-ray in-line phase-contrast imaging with highly symmetric source[J]. Chinese Science Bulletin科学通报,2017,62(22):2544-2552.
APA	Zhang, Jie.,Wang, Yanping.,Chen, Yu.,Jia, Quanjie.,Jiang, Xiaoming.,...&Yi, Qiru.(2017).Synchrotron radiation X-ray in-line phase-contrast imaging with highly symmetric source.Chinese Science Bulletin科学通报,62(22),2544-2552.
MLA	Zhang, Jie,et al."Synchrotron radiation X-ray in-line phase-contrast imaging with highly symmetric source".Chinese Science Bulletin科学通报 62.22(2017):2544-2552.