Suppression of ring artefacts when tomographing anisotropically attenuating samples

Titarenko, Sofya; Titarenko, Valeriy; Kyrieleis, Albrecht; Withers, Philip J.; Carlo, Francesco De

doi:10.1107/s0909049511006005

Cited by 19 publications

(18 citation statements)

References 25 publications

(28 reference statements)

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“…Approaches involving combinations of complementary techniques, such as tomography with elemental specificity, or spatially-resolved spectroscopy (as in the infrared microscopy presented here), are likely to provide the key advances in this area. The ongoing developments in data acquisition [61,62] and handling [63,64] which are beginning to make available in situ analysis of reaction processes by advanced techniques (as in the PDF work discussed here) will provide powerful analytical capabilities, and these data will then require detailed conceptual and/or kinetic modeling to provide a detailed understanding of the key features of the data sets. It is becoming increasingly uncommon for a single technique, used in isolation, to provide important new insight into the structure or chemistry of a complex material system such as an alkali-activated binder; complementary studies provide unparalleled power and depth of analysis which cannot often be achieved from a single technique.…”

Section: Discussionmentioning

confidence: 99%

Nanostructural characterization of geopolymers by advanced beamline techniques

Provis

Hajimohammadi

White

et al. 2013

Cement and Concrete Composites

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This paper presents the outcomes of a series of beamline-based studies, the results of which are combined to provide a more detailed multiscale understanding of the structure and chemistry of geopolymer binders.The range of beamline-based characterization techniques which have been applied to the study of geopolymer binders is increasing rapidly; although no single technique can provide a holistic view of binder structure across all the length scales which are of importance in determining strength development and durability, the synergy achievable through the combination of multiple beamline techniques is leading to rapid advances in knowledge in this area. Studies based around beamline infrared and X-ray fluorescence microscopy, in-situ and ex-situ neutron pair distribution function analysis, and nano-and micro-tomography, are combined to provide an understanding of geopolymer gel chemistry, nano-and microstructure in two and three dimensions, and the influences of seeded nucleation and precursor chemistry in these key areas.The application of advanced characterization methods in recent years has brought the understanding of geopolymer chemistry from a point, not more than a decade ago, when the 1 //dx.doi.org/10.1016/j.cemconcomp.2012.07.003 analysis of the detailed chemistry of the aluminosilicate binder gel was considered intractable due to its disordered ("X-ray amorphous") nature, to the present day where the influence of key compositional parameters on nanostructure is well understood, and both gel structure and reaction kinetics can be manipulated through methods including seeding, temperature variation, and careful mix design. Preprint version of accepted article. Please cite as: J.L. Provis et al., "Nanostructural characterization of geopolymers by advanced beamline techniques", Cement and Concrete Composites 2013, 36(1):56-64. Official journal version is online at http:This paper therefore provides a review outlining the value of nanotechnology -and particularly nanostructural characterization -in the development and optimization of a new class of environmentally beneficial cements and concretes. Key engineering parameters, in particularly strength development and permeability, are determined at a nanostructural level, and so it is essential that gel structures can be analyzed and manipulated at this level; beamline-based characterization techniques are critical in providing the ability to achieve this goal.

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Section: Discussionmentioning

confidence: 99%

Nanostructural characterization of geopolymers by advanced beamline techniques

Provis

Hajimohammadi

White

et al. 2013

Cement and Concrete Composites

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“…Data were collected between 0 and 200° in 1° steps, The exposure time for recording individual images was 20 s for 10 frames. Image reconstruction used an in‐house code to remove artifacts such as motion between exposure of each frame and beam hardening …”

Section: Methodsmentioning

confidence: 99%

Revealing the three dimensional internal structure of aluminium alloys

Thompson

Hashimoto

Zhong

et al. 2013

Surface & Interface Analysis

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Materials ultramicrotomy has been progressed at Manchester for many years, enabling generation of suitably thin specimens for transmission electron microscopy. In addition, the remaining block specimen from which thin, electron transparent specimens have been generated also provides the basis for specimen preparation for high resolution backscattered electron imaging in the scanning electron microscope. This knowledge allows generation of serial sections of appropriate specimens that are oxide-and contamination-free for high resolution observation in the backscattered imaging mode. With recent instrumental developments, i.e. the GATAN 3View System, enabling ultramicrotomy to be performed in-SEM, relatively rapid sectioning and imaging can now be performed with ready reconstruction of electron tomographs. Further, correlative microscopy can be undertaken by utilising the GATAN XuM system in the same scanning electron microscope, enabling non-destructive X-ray tomography in addition to destructive electron tomography. The in-SEM, serial sectioning of selected aluminium alloys is considered here, as well as correlation of the X-ray and electron tomography approaches on the penetration of localised corrosion into an AA2024 T351 aluminium aerospace alloy.

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“…See examples in [27]. For ring artifacts dependant on angular position of a specimen the method presented in [11] can be used.…”

Section: Discussionmentioning

confidence: 99%

“…These methods described in [2], [8], [10], [11] are implemented as routine procedures in a reconstruction software used at imaging beamlines I12 and I13 of Diamond Light Source [22], [23], have also applied to data from beamline 2-BM of Advanced Photon Source, Argonne National Laboratory and have already proved their quality and robustness. The aim of the new algorithm is to increase algorithms' performance by reducing amount of data required to be used during ring artifact suppression and combining them with other filters built in standard reconstruction algorithms.…”

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confidence: 99%

1-D Filter for Ring Artifact Suppression

Titarenko

2016

IEEE Signal Process. Lett.

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Abstract-Reconstruction algorithms in x-ray tomography provide a user with a set of images. For many scientific problems these images should be segmented. Ring artifacts are the most noticeable artifacts which do not allow a scientist to achieve acceptable segmentation especially in case of noisy input data. Several ring artifact suppression methods based on theory of ill-posed problems exist. In this letter the basic ring artifact suppression algorithm is rewritten as a 1D filter, so it does not require separate data processing and can be combined with standard filtering used in filtered backprojection algorithms.

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Suppression of ring artefacts when tomographing anisotropically attenuating samples

Cited by 19 publications

References 25 publications

Nanostructural characterization of geopolymers by advanced beamline techniques

Nanostructural characterization of geopolymers by advanced beamline techniques

Revealing the three dimensional internal structure of aluminium alloys

1-D Filter for Ring Artifact Suppression

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