UGCT: New X-ray radiography and tomography facility

Masschaele, Bert; Cnudde, Veerle; Dierick, Manuel; Jacobs, Patric; Hoorebeke, Luc Van; Vlassenbroeck, Jelle

doi:10.1016/j.nima.2007.05.099

Cited by 165 publications

(113 citation statements)

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“…The scanner is similar to the one as described in Masschaele et al [16] and used in Van den Bulcke et al [17,18]. It has a generic in-house developed CT scanner control software platform [19] that allows full control of the scanner hardware.…”

Section: X-ray Scanningmentioning

confidence: 99%

Combining electrical resistance and 3-D X-ray computed tomography for moisture distribution measurements in wood products exposed in dynamic moisture conditions

Bulcke

Windt

et al. 2013

Building and Environment

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Strength and durability of wood-based products are substantially influenced by moisture. It is, therefore, crucial to monitor the moisture content (MC) distribution in wood products to fully understand their behaviour in dynamic moisture conditions. In this paper, we present a combined X-ray CT method and an adapted version of the electrical resistance MC measurement method for detailed studies on MC distribution in wood products. The X-ray CT method is evaluated using the gravimetrically recorded MC of solid wood. Subsequently, the recorded MC of electrical method is evaluated by using X-ray CT method. Three wood products are used for this purpose, i.e. solid wood, plywood and oriented strand board (OSB) panels. It is proven that X-ray CT method can accurately determine the MC of wood products and thus has great potential for non-destructively measuring the MC distribution in 3D. Furthermore, the results show that electrical method can effectively record the local MC when the MC distribution in this region is even. Otherwise, the position of the electrodes, with regard to specific wood properties has a substantial influence on its performance. Compared with solid wood and OSB, the electrical method performs best in plywood due to its layered structure. The adapted electrical method is an effective tool for continuously monitoring the MC distribution of wood products, taking into account that the electrodes are installed correctly according to the structure of the material and research questions. Combined with X-ray CT scanning, MC distribution of wood-based products under in-service applications, can be monitored.

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Section: X-ray Scanningmentioning

confidence: 99%

Combining electrical resistance and 3-D X-ray computed tomography for moisture distribution measurements in wood products exposed in dynamic moisture conditions

Bulcke

Windt

et al. 2013

Building and Environment

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“…Nevertheless the results demonstrate the quantitative correctness of the simulations both for the measured reconstructed attenuation coefficients and for the noise in the reconstructions. A similar experiment was performed at the scanner described in [1] and a maximum deviation of 6.5% was observed. Note that, as previously mentioned, the effect of the secondary spot can have an influence on the result.…”

Section: Comparison Of Reconstructionsmentioning

confidence: 68%

“…Figure 8(a) shows a projection image of an Al sphere (6 mm diameter) taken at the micro-CT scanner described in [1]. Figure 8(b) shows the effect of the secondary spot on the projection image.…”

Section: Comparison Of Transmission Valuesmentioning

confidence: 99%

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A realistic projection simulator for laboratory based X-ray micro-CT

Dhaene

Pauwels

Schryver

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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In X-ray Computed Tomography (CT) each voxel of the reconstructed image contains a calculated grey value which represents the linear attenuation coefficient for the materials in that voxel. Conventional laboratory based CT scanners use polychromatic X-ray sources and integrating detectors with an energy dependent efficiency. Consequently the reconstructed attenuation coefficients will depend on the spectrum of the source and the spectral sensitivity of the detector. Beam hardening will alter the spectrum significantly as the beam propagates through the sample. Therefore, sample composition and shape will affect the reconstructed attenuation coefficients as well. A polychromatic projection simulator has been developed at the "Centre for X-ray Tomography" of the Ghent University (UGCT) which takes into account the aforementioned variables, allowing for complete and realistic simulations of CT scans for a wide range of geometrical setups. Monte Carlo simulations of the X-ray tubes and detectors were performed to model their spectral behaviour. In this paper, the implementation and features of the program are discussed. Simulated and real CT scans are compared to demonstrate the quantitative correctness of the simulations. Experiments performed at two different UGCT scanners yield a maximum deviation of 3.9% and 6.5% respectively, between the measured and simulated reconstructed attenuation coefficients.

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“…The high brilliance of synchrotron radiation results in a clear superiority in terms of achievable spatial resolution and signal-to-noise ratio (Baruchel et al, 2006), but the number of synchrotron facilities is limited and the operational cost is very high. Lab-based micro-CT systems (Jakubek et al, 2006;Masschaele et al, 2007) on the other hand have lower X-ray flux but are more cost-efficient. Nowadays, a large number of desktop CT systems exist (Sasov and Van Dyck, 1998) which are commercially available, making micro-CT accessible for a large number of researchers.…”

Section: Towards Micro-ctmentioning

confidence: 99%

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

Cnudde

Boone

2013

Earth-Science Reviews

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Please cite this article as: Cnudde, V., Boone, M.N., "High-resolution X-ray computed tomography in geosciences: a review of the current technology and applications", Earth Science Reviews (2013Reviews ( ), doi: 10.1016Reviews ( /j.earscirev.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T AbstractHigh-resolution X-ray Computed Tomography (HRXCT) or micro-CT (µCT) is a frequently used non-destructive 3D imaging and analysis technique for the investigation of internal structures of a large variety of objects, including geomaterials. Although the possibilities of X-ray micro-CT are becoming better appreciated in earth science research, the demands on this technique are also approaching certain physical limitations. As such, there remains a lot of research to be done in order to solve all the technical problems that occur when higher demands are put on the technique. In this paper, a review of the principle, the advantages and limitations of X-ray CT itself are presented, together with an overview of some current applications of micro-CT in geosciences. One of the main advantages of this technique is the fact that it is a non-destructive characterization technique which allows 4D monitoring of internal structural changes at resolutions down to a few hundred nanometers. Limitations of this technique are the operator dependency for the 3D image analysis from the reconstructed data, the discretations effects and possible imaging artefacts. Driven by the technological and computational progress, the technique is continuously growing as an analysis tool in geosciences and is becoming one of the standard techniques, as is shown by the large and still increasing number of publications in this research area. It is foreseen that this number will continue to rise, and micro-CT will become an indispensable technique in the field of geosciences.

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UGCT: New X-ray radiography and tomography facility

Cited by 165 publications

References 1 publication

Combining electrical resistance and 3-D X-ray computed tomography for moisture distribution measurements in wood products exposed in dynamic moisture conditions

Combining electrical resistance and 3-D X-ray computed tomography for moisture distribution measurements in wood products exposed in dynamic moisture conditions

A realistic projection simulator for laboratory based X-ray micro-CT

High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications

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