Abstract
A simple method of phase-and-amplitude extraction is derived that corrects for image blurring induced by partially spatially coherent incident illumination using only a single intensity image as input. The method is based on Fresnel diffraction theory for the case of high Fresnel number, merged with the space-frequency description formalism used to quantify partially coherent fields and assumes the object under study is composed of a single-material. A priori knowledge of the object's complex refractive index and information obtained by characterizing the spatial coherence of the source is required. The algorithm was applied to propagation-based phase-contrast data measured with a laboratory-based micro-focus x-ray source. The blurring due to the finite spatial extent of the source is embedded within the algorithm as a simple correction term to the so-called Paganin algorithm and is also numerically stable in the presence of noise.
Original language | English |
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Article number | 055605 |
Journal | Journal of Optics |
Volume | 20 |
Issue number | 5 |
Number of pages | 5 |
ISSN | 1464-4258 |
DOIs | |
Publication status | Published - 2018 |
Keywords
- X-ray optics
- Coherence theory
- Imaging systems