Improvement of quantitative performance of imaging x-ray microscope by reduction of edge-enhancement effect

X-Ray Microscopy Conference 2016

Takeuchi, A.^1 ; Uesugi, K.^1 ; Suzuki, Y.^1,2

Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Japan^1

Graduate School of Frontier Sciences, University of Tokyo, Japan^2

关键词: Apodizations;    Edge enhancements;    Edge-enhancement effects;    Efficiency distributions;    Field of views;    Fresnel zone plate;    Imaging properties;    Peripheral regions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/849/1/012055/pdf
DOI  :  10.1088/1742-6596/849/1/012055

来源: IOP

【 摘 要 】

A Fresnel zone plate (FZP) with a gradually-decreasing zone thickness from the centre to the outer region, called as an Apodization FZP (A-FZP) has been developed for the purpose of the improvements of imaging properties of imaging (full-field) x-ray microscope. Diffraction efficiency distribution of a A-FZP has a sloped-shouldered shape like a Gaussian, resulting a Gaussian-like pupil and Gaussian-like point spread function without any side peaks. Using this A-FZP, imaging properties at the peripheral region of the field of view was remarkably improved by decreasing edge-enhancement contrast and ringing which have been serious problem on the imaging properties with the conventional FZP objective optics.