2020/05/31 by David M. Paganin, V. Favre‐Nicolin, Vincent Favre-Nicolin +9
Engineering · Physics and Astronomy · #Advanced X-ray Imaging Techniques #Algorithm #Amplitude #Computer science #Contrast (vision) #Detector #Fourier transform #Image resolution #Laser-Plasma Interactions and Diagnostics #Optics #Paraxial approximation #Phase contrast microscopy #Phase retrieval #Phase-contrast imaging #Physics #Sample (material) #Spatial frequency #X-ray Spectroscopy and Fluorescence Analysis #eess.IV #physics.app-ph #physics.optics
paper · pdf · doi:10.1088/2040-8986/abbab9
published as Journal of Optics 22 115607 (2020)
arxiv created 2020/08/30 · openalex publication_date 2020/09/22 · arxiv updated 2021/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract 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.