3D tree-ring analysis using helical X-ray tomography |
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| Affiliation: | 1. UGCT – Ghent University, Department of Forest and Water Management, Laboratory of Wood Technology, Coupure Links 653, 9000 Ghent, Belgium;2. Swedish University of Agricultural Sciences, Centre for Image Analysis, Box 337, SE-751 05 Uppsala, Sweden;3. UGCT – Ghent University, Department of Physics and Astronomy, Proeftuinstraat 86, 9000 Ghent, Belgium;4. Flanders Heritage Agency, Koning Albert II-laan 19, bus 5, 1210 Brussels, Belgium;1. Dendrolab.ch, Institute of Geological Sciences, University of Berne, Baltzerstrasse 1+3, CH-3012 Berne, Switzerland;2. Quaternary Sciences, Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden;3. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada;1. School of Geography and Geosciences, University of St Andrews, UK;2. Cybis Elektronik & Data AB, Saltsjöbaden, Sweden;3. Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden;4. Department of Geography, Swansea University, Swansea, UK;1. Landesamt für Denkmalpflege Baden-Württemberg, Berliner Straße 12, 73728 Esslingen am Neckar, Germany;2. Landesamt für Denkmalpflege Baden-Württemberg, Fischersteig 9, 78343 Hemmenhofen, Germany |
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| Abstract: | The current state-of-the-art of tree-ring analysis and densitometry is still mainly limited to two dimensions and mostly requires proper treatment of the surface of the samples. In this paper we elaborate on the potential of helical X-ray computed tomography for 3D tree-ring analysis. Microdensitometrical profiles are obtained by processing of the reconstructed volumes. Correction of the structure direction, taking into account the angle of growth rings and grain, results in very accurate microdensity and precise ring width measurements. Both a manual as well as an automated methodology is proposed here, of which the MATLAB© code is available. Examples are given for pine (Pinus sylvestris L.), oak (Quercus robur L.) and teak (Tectona grandis L.). In all, the methodologies applied here on the 3D volumes are useful for growth related studies, enabling a fast and non-destructive analysis. |
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| Keywords: | Dendrochronology Densitometry Helical CT |
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