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Application of the DIRECTT algorithm to sub-nanometer electron tomography

  • Tomography data obtained from transmission electron microscopes are especially attractive due to their unrivaled spatial resolution in the nanometer range or even less, but they require enormous efforts in sample preparation and suffer from a diverse accumulation of experimental restrictions, which unavoidably result in fundamental reconstruction artifacts. These restrictions refer to: partial opacity, a limited view (limited angle or missing wedge), very few angles (with respect to the detector size), limited to a region of interest (ROI; due to the sample size), variable angular increments as well as sample degradation due the interactions with the electron beam. An advanced version of the DIRECTT (Direct Iterative Reconstruction of Computed Tomography Trajectories) algorithm proves to cope with most of these severe deviations from ideal CT measuring conditions. However, careful data preprocessing is required in order to exploit the capabilities of the algorithm. Nanometer sizedTomography data obtained from transmission electron microscopes are especially attractive due to their unrivaled spatial resolution in the nanometer range or even less, but they require enormous efforts in sample preparation and suffer from a diverse accumulation of experimental restrictions, which unavoidably result in fundamental reconstruction artifacts. These restrictions refer to: partial opacity, a limited view (limited angle or missing wedge), very few angles (with respect to the detector size), limited to a region of interest (ROI; due to the sample size), variable angular increments as well as sample degradation due the interactions with the electron beam. An advanced version of the DIRECTT (Direct Iterative Reconstruction of Computed Tomography Trajectories) algorithm proves to cope with most of these severe deviations from ideal CT measuring conditions. However, careful data preprocessing is required in order to exploit the capabilities of the algorithm. Nanometer sized Ruthenium catalyst particles for fuel cell applications are 3D imaged at a few Ångström resolution in order to estimate their partial free surface on carbon black supports, which rule the efficiency of the catalytic activity. Comparisons of DIRECTT reconstructions to the conventional filtered back projection, prove the significant improvements.zeige mehrzeige weniger

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Metadaten
Autoren/innen:Andreas Kupsch, Manfred P. Hentschel, Axel Lange, R. Grothausmann, I. Manke
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):DIR 2011 - International symposium on digital industrial raidology and computed tomography (Proceedings)
Jahr der Erstveröffentlichung:2011
Veröffentlichende Institution:Bundesanstalt für Materialforschung und -prüfung (BAM)
Verlag:Deutsche Gesellscahft für Zerstörungsfreie Prüfung e.V. (DGZfP)
Ausgabe/Heft:DGZfP-BB 128 (Tu.3.3)
Erste Seite:1
Letzte Seite:6
Freie Schlagwörter:Computed tomography; Electron tomography; Reconstruction algorithms
Veranstaltung:DIR 2011 - International symposium on digital industrial raidology and computed tomography
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:20.06.2011
Enddatum der Veranstaltung:22.06.2011
URN:urn:nbn:de:kobv:b43-243577
ISBN:978-3-940283-34-4
Verfügbarkeit des Dokuments:Datei für die Öffentlichkeit verfügbar ("Open Access")
Lizenz (Deutsch):License LogoCreative Commons - Namensnennung-Keine Bearbeitung
Datum der Freischaltung:31.12.2015
Referierte Publikation:Nein
Schriftenreihen ohne Nummerierung:Wissenschaftliche Artikel der BAM