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• W4289638418 abstract "Based on phase retrieval, lensless coherent imaging and in particular holography offers quantitative phase and amplitude images. This is of particular importance for spectral ranges where suitable lenses are challenging, such as for hard x-rays. Here, we propose a phase retrieval approach for inline x-ray holography based on Tikhonov regularization applied to the full nonlinear forward model of image formation. The approach can be seen as a nonlinear generalization of the well-established contrast-transfer-function (CTF) reconstruction method. While similar methods have been proposed before, the current work achieves nonlinear, constrained phase retrieval at competitive computation times. We thus enable high-throughput imaging of optically strong objects beyond the scope of CTF. Using different examples of inline holograms obtained from illumination by a x-ray waveguide-source, we demonstrate superior image quality even for samples which do not obey the assumption of a weakly varying phase. Since the presented approach does not rely on linearization, we expect it to be well suited also for other probes such as visible light or electrons, which often exhibit strong phase interaction." @default.
• W4289638418 created "2022-08-03" @default.
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• W4289638418 date "2022-08-24" @default.
• W4289638418 modified "2023-10-14" @default.
• W4289638418 title "Fast algorithms for nonlinear and constrained phase retrieval in near-field X-ray holography based on Tikhonov regularization" @default.
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• W4289638418 doi "https://doi.org/10.1364/oe.462368" @default.
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