TY - CONF A1 - Homberg, U. A1 - Baum, D. A1 - Prohaska, S. A1 - Kalbe, Ute A1 - Witt, K. J. T1 - Automatic extraction and analysis of realistic pore structures from muCT data for pore space characterization of graded soil T2 - ICSE6 - 6th International conference on scour and erosion CY - Paris, France DA - 2012-08-27 KW - Microtomography KW - Image analysis KW - Pore structure KW - Pore constriction KW - Suffosion KW - Graded soil PY - 2012 IS - ICSE6-181 SP - 345 EP - 352 AN - OPUS4-26965 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Homberg, U. A1 - Binner, Richard A1 - Prohaska, S. A1 - Dercksen, V.J. A1 - Kuß, A. A1 - Kalbe, Ute ED - Witt, Karl Josef T1 - Determining geometric grain structure from X-ray micro-tomograms of gradated soil T2 - Workshop "Internal Erosion" CY - Weimar, Germany DA - 2008-11-26 KW - Gradated soil KW - Suffosive erosion phenomena KW - Pore and grain structure KW - Micro computed tomography KW - Morphologic image processing PY - 2008 SN - 978-3-86068-392-7 N1 - Serientitel: Schriftenreihe Geotechnik – Series title: Schriftenreihe Geotechnik IS - 21 SP - 37 EP - 52 PB - Bauhaus-Univ. CY - Weimar AN - OPUS4-19866 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Semar, O. A1 - Binner, Richard A1 - Homberg, U. A1 - Kalbe, Ute A1 - Mehlhorn, T. A1 - Prohaska, S. A1 - Slowik, V. A1 - Witt, K. J. ED - Witt, K. J. T1 - Conditions for suffosive erosion phenomena in soils - concept and approach - T2 - Workshop "Internal Erosion" CY - Weimar, Germany DA - 2008-11-26 KW - Pore KW - Pore throat KW - Constriction sizes KW - CT-scan KW - Modelling PY - 2008 SN - 978-3-86068-392-7 N1 - Serientitel: Schriftenreihe Geotechnik – Series title: Schriftenreihe Geotechnik IS - 21 SP - 29 EP - 35 PB - Bauhaus-Univ. CY - Weimar AN - OPUS4-19867 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Binner, Richard A1 - Homberg, U. A1 - Prohaska, S. A1 - Kalbe, Ute A1 - Witt, K. J. ED - Burns, S.E. ED - Bhatia, S.K. ED - Avila, C. M. C. ED - Hunt, B.E. T1 - Identification of descriptive parameters of the soil pore structure using experiments and CT data T2 - ICSE-5 - 5th International conference on scour and erosion CY - San Francisco, CA, USA DA - 2010-11-07 KW - Pore KW - Pore throat KW - Constriction sizes KW - CT-scan KW - Modelling PY - 2010 UR - http://books.google.de/books?id=tpyWlGWonOEC&pg=PA397&dq=Identification+of+descriptive+parameters+of+the+soil+pore+structure+using+experiments+and+CT+data&hl=de&ei=FjxBTbbiHYmbOuvQrOoB&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCoQ6AEwAA#v=onepage&q=Ide SN - 978-0-7844-1147-6 N1 - Serientitel: Geotechnical Special Publication – Series title: Geotechnical Special Publication VL - 210 SP - 397 EP - 407 AN - OPUS4-23053 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Homberg, U. A1 - Baum, D. A1 - Prohaska, S. A1 - Günster, Jens A1 - Krauss-Schüler, Stefanie T1 - Adapting trabecular structures for 3D printing: an image processing approach based on μCT data N2 - Materials with a trabecular structure notably Combine advantages such as lightweight, reasonable strength, and permeability for fl uids. This combination of advantages is especially interesting for tissue engineering in trauma surgery and orthopedics. Bone-substituting scaffolds for instance are designed with a trabecular structure in order to allow cell migration for bone ingrowth and vascularization. An emerging and recently very popular technology to produce such complex, porous structures is 3D printing. However, several technological aspects regarding the scaffold architecture, the printable resolution, and the feature size have to be considered when fabricating scaffolds for bone tissue replacement and regeneration. Here, we present a strategy to assess and prepare realistic trabecular structures for 3D printing using image analysis with the aim of preserving the structural elements. We discuss critical conditions of the printing system and present a 3-stage approach to adapt a trabecular structure from μ CT data while incorporating knowledge about the printing system. In the first stage, an image-based extraction of solid and void structures is performed, which results in voxel- and graph-based representations of the extracted structures. These representations not only allow us to quantify geometrical properties such as pore size or strut geometry and length. But, since the graph represents the geometry and the topology of the initial structure, it can be used in the second stage to modify and adjust feature size, volume and sample size in an easy and consistent way. In the final reconstruction stage, the graph is then converted into a voxel representation preserving the topology of the initial structure. This stage generates a model with respect to the printing conditions to ensure a stable and controlled voxel placement during the printing process. KW - Additive manufacturing, 3D printing KW - Trabecular structures KW - Image-based analysis PY - 2017 DO - https://doi.org/10.1088/2057-1976/aa7611 SN - 2057-1976 VL - 3 IS - 3 SP - Article 035027, 1 EP - 14 PB - IOP Publishing Ltd AN - OPUS4-40744 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -