微聚焦管硬x射线位相衬度成像

利用微聚焦管硬x射线光源进行同轴位相衬度成像实验，所用的光源聚焦尺寸最小可达0.5μm.根据微聚焦硬x射线管的光学传递函数，对光源尺寸、相干长度等因素对成像分辨率的影响进行了分析.对新鲜的未经任何处理的生物样品进行了位相衬度成像，分辨率在10μm左右，并和吸收衬度成像进行了对比.实验结果表明利用微聚焦管作为硬x射线光源，多色硬x射线位相衬度成像可以得到比吸收衬度成像高得多的分辨率. 关键词： 位相衬度成像 微聚焦管x射线源 吸收衬度成像 光学传递函数

Phase-contrast imaging with microfocus x-ray source

We report the experimental results of the in line phase contrast imaging with a microfocus x ray source. The minimized focused spot size of the x ray source is about 05μm. According to the optical transfer function of the microfocus x ray source, the effects of the size of the x ray source, the coherent length of x ray on the imaging resolution are discussed. The phase contrast images of the fresh biomaterials are obtained with 10μm resolution. Compared with the absorption contrast image of the sample, the fine structure of the fresh biomaterials can be observed distinctly in the phase contrast image.