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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.16: Poster
Thursday, March 15, 2018, 15:00–17:00, Poster E
Limitations of Single-Step Phase Retrieval — •Johannes Hagemann1,2, Mareike Töpperwien1, and Tim Salditt1 — 1Institut für Röntgenphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — 2current address: DESY, X-Ray Nanoscience and X-Ray, Optics, Notkestraße 85, 22607 Hamburg
In order to harness the full information of propagation-based phase contrast images obtained with coherent x-rays, one has to carry out a phase reconstruction on the images. This strategy is applied for data obtained in various optical regimes ranging from the edge enhancement to the deeply holographic regime.
By placing assumptions on the specimen e.g. weak absorption one can construct several single-step solutions for the respective optical regime. Despite the merrits of these schemes, the reconstruction obtained is only as good as the assumptions hold.
We demonstrate on an example near-field hololographic dataset, the flaws of the single-step reconstruction based on the contrast transfer function[1] and the possible improvement gained by applying an iterative reconstruction scheme.
[1] P. Cloetens et al., Appl. Phys. Lett.(1999), 75, 2912*2914.