| |  Online-Ressource |
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| Verfasst von: | Hofmann, Ralf [VerfasserIn]  |
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| | Schober, Alexander [VerfasserIn] |
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| | Hahn, Steffen [VerfasserIn] |
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| | Moosmann, Julian [VerfasserIn] |
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| | Kashef, Jubin [VerfasserIn] |
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| | Hertel, Madeleine [VerfasserIn] |
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| | Weinhardt, Venera [VerfasserIn] |
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| | Hänschke, Daniel [VerfasserIn] |
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| | Helfen, Lukas [VerfasserIn] |
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| | Salazar, Iván A. Sánchez [VerfasserIn] |
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| | Guigay, Jean-Pierre [VerfasserIn] |
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| | Xiao, Xianghui [VerfasserIn] |
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| | Baumbach, Tilo [VerfasserIn] |
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| Titel: | Gauging low-dose X-ray phase-contrast imaging at a single and large propagation distance |
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| Verf.angabe: | Ralf Hofmann, Alexander Schober, Steffen Hahn, Julian Moosmann, Jubin Kashef, Madeleine Hertel, Venera Weinhardt, Daniel Hänschke, Lukas Helfen, Iván A. Sánchez Salazar, Jean-Pierre Guigay, Xianghui Xiao, Tilo Baumbach |
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| E-Jahr: | 2016 |
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| Jahr: | 19 Feb 2016 |
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| Umfang: | 18 S. |
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| Fussnoten: | Gesehen am 19.05.2020 |
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| Titel Quelle: | Enthalten in: Optics express |
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| Ort Quelle: | Washington, DC : Soc., 1997 |
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| Jahr Quelle: | 2016 |
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| Band/Heft Quelle: | 24(2016), 4, Seite 4331-4348 |
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| ISSN Quelle: | 1094-4087 |
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| Abstract: | The interactions of a beam of hard and spatio-temporally coherent X-rays with a soft-matter sample primarily induce a transverse distribution of exit phase variations δϕ (retardations or advancements in pieces of the wave front exiting the object compared to the incoming wave front) whose free-space propagation over a distance z gives rise to intensity contrast gz. For single-distance image detection and |δϕ| ≪ 1 all-order-in-z phase-intensity contrast transfer is linear in δϕ. Here we show that ideal coherence implies a decay of the (shot-)noise-to-signal ratio in gz and of the associated phase noise as z−1/2 and z−1, respectively. Limits on X-ray dose thus favor large values of z. We discuss how a phase-scaling symmetry, exact in the limit δϕ → 0 and dynamically unbroken up to |δϕ| ∼ 1, suggests a filtering of gz in Fourier space, preserving non-iterative quasi-linear phase retrieval for phase variations up to order unity if induced by multi-scale objects inducing phase variations δϕ of a broad spatial frequency spectrum. Such an approach continues to be applicable under an assumed phase-attenuation duality. Using synchrotron radiation, ex and in vivo microtomography on frog embryos exemplifies improved resolution compared to a conventional single-distance phase-retrieval algorithm. |
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| DOI: | doi:10.1364/OE.24.004331 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1364/OE.24.004331 |
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| | Volltext: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-24-4-4331 |
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| | DOI: https://doi.org/10.1364/OE.24.004331 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| Sach-SW: | Phase noise |
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| | Phase retrieval |
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| | Spatial frequency |
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| | Wavefronts |
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| | X ray imaging |
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| | X ray optics |
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| K10plus-PPN: | 1698541708 |
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| Verknüpfungen: | → Zeitschrift |
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Gauging low-dose X-ray phase-contrast imaging at a single and large propagation distance / Hofmann, Ralf [VerfasserIn]; 19 Feb 2016 (Online-Ressource)
