HECTOR: A 240kV micro-CT setup optimized for research

Masschaele, Bert; Dierick, Manuel; Loo, Denis Van; Boone, Matthieu N.; Brabant, Loes; Pauwels, Elin; Cnudde, Veerle; Hoorebeke, Luc Van

doi:10.1088/1742-6596/463/1/012012

Cited by 155 publications

(111 citation statements)

References 4 publications

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“…However, image analysis proved that we captured almost the full pore space with this resolution 32,33 (27.1% porosity based on image analysis; 28% porosity based on mercury intrusion porosimetry $30 lm average pore size of the uni-modal pore system). 6,34 In addition, we use square microcapillaries as simple model systems for a single pore within a porous medium, to investigate the kinetics of dissolution and deliquescence of crystals, followed by recrystallization.…”

Section: Methodsmentioning

confidence: 97%

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Drying of salt contaminated porous media: Effect of primary and secondary nucleation

Désarnaud

Derluyn

Molari

et al. 2015

Journal of Applied Physics

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Drying of salt contaminated porous media: Effect of primary and secondary nucleationDesarnaud, J.E.; Derluyn, H.; Molari, L.; de Miranda, S.; Cnudde, V.; Shahidzadeh, N.F. Published in:Journal of Applied Physics DOI:10.1063/1.4930292 Link to publication Citation for published version (APA):Desarnaud, J., Derluyn, H., Molari, L., de Miranda, S., Cnudde, V., & Shahidzadeh, N. (2015). Drying of salt contaminated porous media: Effect of primary and secondary nucleation. Journal of Applied Physics, 118(11), [114901]. DOI: 10.1063/1.4930292 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The drying of porous media is of major importance for civil engineering, geophysics, petrophysics, and the conservation of stone artworks and buildings. More often than not, stones contain salts that can be mobilized by water (e.g., rain) and crystallize during drying. The drying speed is strongly influenced by the crystallization of the salts, but its dynamics remains incompletely understood. Here, we report that the mechanisms of salt precipitation, specifically the primary or secondary nucleation, and the crystal growth are the key factors that determine the drying behaviour of salt contaminated porous materials and the physical weathering generated by salt crystallization. When the same amount of water is used to dissolve the salt present in a stone, depending on whether this is done by a rapid saturation with liquid water or by a slow saturation using water vapor, different evaporation kinetics and salt weathering due to different crystallization pathways are observed.

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Section: Methodsmentioning

confidence: 97%

“…32 The resulting voxel size of the reconstructed datasets was 5 lm 3 . The samples were initially scanned after the salt crystallization cycles, and subsequently washed out to be scanned in their natural state.…”

Section: Methodsmentioning

confidence: 99%

Drying of salt contaminated porous media: Effect of primary and secondary nucleation

Désarnaud

Derluyn

Molari

et al. 2015

Journal of Applied Physics

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“…Here, a high energy CT system called HECTOR is available [7], which is suited for strongly attenuating objects, such as the large concrete blocks under investigation. To obtain the CT data, the samples are placed on a rotating stage in between the scanner's X-ray source and detector (illustrated in Fig.…”

Section: Mà Ct Scanning Techniquementioning

confidence: 99%

Integral procedure to assess crack filling and mechanical contribution of polymer-based healing agent in encapsulation-based self-healing concrete

Gilabert

Tittelboom

Stappen

et al. 2017

Cement and Concrete Composites

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“…From a general setup, instead of the X-ray source and the detectors to rotate around the patients or object to be scanned, the object itself is rotated on a turntable. [33].…”

Section: Micro-ct Scannermentioning

confidence: 99%

Image Analysis and Visualization of the Human Mastoid Air Cell System

Cros¹

2015

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Legend: CO cochlea, EC ear canal, FN facial nerve, MACS mastoid air cell system, MC micro-channels, OSS ossicles (manubrium of the incus), TM tympanic membrane, TS trabecular spaces, TYM tympanum (middle ear). Image Analysis and Visualization of the Human Mastoid Air Cell System © 2015 Olivier Cros Department of Biomedical EngineeringLinköping University, Sweden ISBN 978-91-7685-941-4 ISSN 0280-7971 LIU-TEK-LIC-1975:N AbstractFrom an engineering background, it is often believed that the human anatomy has already been fully described. Radiology has greatly contributed to understand the inside of the human body without surgical intervention. Despite great advances in clinical CT scanning, image quality is still related to a limited amount X-ray exposure for the patient safety. This limitation prevents fine anatomical structures to be visible and, more importantly, to be detected. Where such modality is of great advantage for screening patients, extracting parameters like surface area and volume implies the bone structure to be large enough in relation to the scan resolution.The mastoid, located in the temporal bone, houses an air cell system whose cells have a variation in size that can go far below current conventional clinical CT scanner resolution. Therefore, the mastoid air cell system is only partially represented on a CT scan. Any statistical analysis will be biased towards air cells of smaller size. To allow a complete representation of the mastoid air cell system, a micro-CT scanner is more adequate. Micro-CT scanning uses approximately the same amount of X-rays but for a much longer exposure time compared to what is normally allowed for patients. Human temporal bone specimens are therefore necessary when using such scanning method. Where the conventional clinical CT scanner lacks level of minutes details, micro-CT scanning provides an overwhelming amount of fine details.Prior to any image analysis of medical data, visualization of the data is often needed to learn how to extract the structures of interest for further processing. Visualization of micro-CT scans is of no exception. Due to the high resolution nature of the data, visualization of such data not only requires modern and powerful computers, but also necessitates a tremendous amount of time to adjust the hiding of irrelevant structures, to find the correct orientation, while emphasising the structure of interest. Once the quality of the data has been assessed, and a strategy for the image processing has been decided, the image processing can start, to in turn extract metrics such as the surface area or volume and draw statistics from it. The temporal bone being one of the most complex in the human body, visualization of micro-CT scanning of this bone awakens the curiosity of the experimenter, especially with the correct visualization settings.This thesis first presents a statistical analysis determining the surface area to volume ratio of the mastoid air cell system of human temporal bone, from micro-CT scanning using methods previously appl...

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HECTOR: A 240kV micro-CT setup optimized for research

Cited by 155 publications

References 4 publications

Drying of salt contaminated porous media: Effect of primary and secondary nucleation

Drying of salt contaminated porous media: Effect of primary and secondary nucleation

Integral procedure to assess crack filling and mechanical contribution of polymer-based healing agent in encapsulation-based self-healing concrete

Image Analysis and Visualization of the Human Mastoid Air Cell System

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