论文标题
通过将周期性边界条件纳入单距离硬X射线相位，提高空间分辨率
Boosting spatial resolution by incorporating periodic boundary conditions into single-distance hard-x-ray phase retrieval
论文作者
论文摘要
Paganin等人引起的一种简单的相干模仿方法。使用基于X射线传播的单个相对比图像，广泛用于样品的相位振幅重建。该方法假设样品到检测器的距离足够小，与统一相比，相关的菲涅尔数量很大。在层析成像设置中使用，该算法特别有效，使用基于单个繁殖的相对比图像为每个投影进行。在这里，我们开发了该方法的简单扩展，该扩展改善了非常细的样品特征的重建对比度。这提供了与原始方法相对于高傅里叶频率相关的优质空间细节的第一原理动机，并受到了几项最近使用经验上有经验的傅立叶过滤器的作品的启发。
A simple coherent-imaging method due to Paganin et al. is widely employed for phase-amplitude reconstruction of samples using a single paraxial x-ray propagation-based phase-contrast image. The method assumes that the sample-to-detector distance is sufficiently small for the associated Fresnel number to be large compared to unity. The algorithm is particularly effective when employed in a tomographic setting, using a single propagation-based phase-contrast image for each projection. Here we develop a simple extension of the method, which improves the reconstructed contrast of very fine sample features. This provides first-principles motivation for boosting fine spatial detail associated with high Fourier frequencies, relative to the original method, and was inspired by several recent works employing empirically-obtained Fourier filters to a similar end.
