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X射线衍射增强相衬成像相位信息提取方法研究 总被引:2,自引:0,他引:2
基于同步辐射的X射线衍射增强相衬成像有效地应用于低吸收轻物质(例如软组织)材料的内部结构检查,其关键技术是如何从DEI图像中提取出反映物体相位梯度信息的折射角图像.本文在综合研究了光学几何近似方法和多图统计方法等相位信息提取技术之后,提出了``统计--几何光学近似'相位信息提取的新方法, 并在北京BSRF形貌站上进行了实验验证. 实验表明,新方法能够大大提高光学几何近似求解的精确度和折射角图像的信噪比. 相似文献
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For weakly absorbing materials, image contrast can be enhanced by
phase contrast in formation. The effectiveness of the in-line phase
contrast technique relies on its ability to record intensity data
which contain information on the x-ray's phase shift. Four kinds of
approaches to the relationship between intensity distribution and
phase shift are reviewed and discussed. A micro-focal x-ray source
with high geometrical magnification is used to acquire phase
contrast images. A great improvement on image quality is shown and
geometrical parameters are modified for comparison between different
imaging positions. 相似文献
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