Beeckman, H.

Boone, M.

De Ridder, M.

De Witte, Y.

Deforce, K.

Dierick, M.

Haneca, K.

Hubau, W.

Masschaele, B.

Van Acker, J.

Van den Bulcke, J.

Van Hoorebeke, L.

Van Loo, D.

English

Orfeo BELSPO Instutional Open Access Repository for Federal Organisation

1  MULTI-RESOLUTION X-RAY TOMOGRAPHY FOR MULTI-PURPOSE USE IN CULTURAL HERITAGE Jan Van den Bulcke1,2, Denis Van Loo1,,3,4, Manuel Dierick1,3, Matthieu Boone1,3, Bert Masschaele1,3, Yoni De Witte1,3, Kristof Haneca5, Koen Deforce5, Maaike De Ridder1,2,6, Wannes Hubau1,2,6, Hans Beeckman6, Luc Van Hoorebeke1,3, Joris Van Acker1,2 1 UGCT, University Ghent Centre for X-ray Tomography, Proeftuinstraat 86, 9000 Gent, Belgium 2 Laboratory of Wood Technology, Department of Forest and Water Management, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium 3 Department of Physics and Astronomy, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium 4 Department of Soil Management and Soil Care, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Gent, Belgium 5 Flemish Heritage Institute, Koning Albert II-laan 19, bus 5, 1210 Brussel, Belgium 6 Royal Museum for Central Africa, Laboratory for Wood Biology and Xylarium, Leuvensesteenweg 13, 3080 Tervuren, Belgium  Nanowood is the latest multi-resolution X-ray tomography setup developed at UGCT, the Ghent University Centre for X-ray Tomography. It consists of an 8-axis motorized stage combined with two X-ray tubes and two X-ray detectors, specifically designed to obtain very high resolution scans as well as scans of larger objects. The system offers a large range of operation freedom, all combined in versatile acquisition routines (standard or fast scanning, tilling, helix, etc). It has a generic in-house developed CT scanner control software platform (Dierick et al. 2010) that allows full control of the scanner hardware. Reconstruction of the scans is performed with Octopus, a tomography reconstruction package for parallel and cone-beam geometry (Vlassenbroeck et al. 2007). The latest developments include GPU-based helix reconstruction and phase-contrast filtering using dedicated algorithms such as MBA (Modified Bronnikov Algorithm, Boone et al. (2009)) and BAC (Bronnikov Aided Correction, De Witte et al. (2010)). Thanks to the flexibility of Nanowood, this state-of-the-art scanner can be deployed in many different fields of research with an interest in non-destructive visualization of the internal structure of objects in a high-throughput chain, but the scanner at the Laboratory of Wood Technology is dedicated to wood research sensu lato. The multi-purpose usability of this scanner is demonstrated with scans of ethnographical statues from the Democratic Republic of Congo (DRC), tomographical microscopy for wood anatomical identification of wooden objects, the study of corrosion preserved wood from an archaeological site in Flanders and the detailed study of wood decay (Figure 1), all important issues in a cultural heritage context. These examples pinpoint at the possibilities of the modular and flexible set-up of Nanowood, allowing scanning with a resolution of 0.2 mm for samples of 37 cm in diameter and a maximal length of approximately 20-30 cm down to approximately 400nm for objects that have about the size of a splinter. The improvements of scanner hard- and software compared to a few years ago are of such a magnitude that resolution, scanning and reconstruction speed, resulting image quality and image processing performance are meeting the highest standards. Furthermore, the ongoing interaction within UGCT between wood scientists and X-ray physicists enables an optimal use, refinement and continuous updating of the equipment and accompanying software for scanner control, reconstruction, data analysis and visualization. 2   Figure 1. (a) 3D rendering of an ethnographical statue from DRC; (b) transversal (xs), tangential (tls) and radial (rls) view on Ipé (Tabebuia spp.); (c) radial section through a piece of corrosion preserved wood; (d) fungal growth on beech and (e) fungal hyphae.  References Boone, M., Y. De Witte, M. Dierick, J. Van den Bulcke, J. Vlassenbroeck, and L. Van Hoorebeke , 2009, Practical use of the modified Bronnikov algorithm in micro-CT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 267(7), 1182-1186. Dierick, M., D. Van Loo, B. Masschaele, M.N. Boone, and L. Van Hoorebeke, 2010, A LabVIEW (R) based generic CT scanner control software platform, Journal of X-ray Science and Technology, 18(4), 451-461. De Witte, Y., M. Boone, J. Vlassenbroeck, M. Dierick, and L. Van Hoorebeke, 2009, Bronnikov-aided correction for x-ray computed tomograph, Journal of the Optical Society of America A - optics, image science, and vision, 26(4), 890-894. Vlassenbroeck, J., M. Dierick, B. Masschaele, V. Cnudde, L. Van Hoorebeke and P. Jacobs, 2007, Software tools for quantification of X-ray microtomography at the UGCT. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 580, 442-445. 

Multi-resolution X-ray tomography for multi-purpose use in cultural heritage

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Multi-resolution X-ray tomography for multi-purpose use in cultural heritage

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