The ASTRA Toolbox: A platform for advanced algorithm development in electron tomography

Aarle, Wim van; Palenstijn, Willem Jan; Beenhouwer, Jan De; Altantzis, Thomas; Batenburg, Kees Joost; Sijbers, Jan

doi:10.1016/j.ultramic.2015.05.002

Cited by 755 publications

(571 citation statements)

References 33 publications

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“…All reconstruction methods were applied with 200 iterations, with the exception of the CGLS-NLST method, where this parameter was optimized for lowest RRMSE with respect to the ground truth image. The algorithms were implemented with the ASTRA toolbox [25]- [27].…”

Section: B Reconstruction Methodsmentioning

confidence: 99%

An Iterative CT Reconstruction Algorithm for Fast Fluid Flow Imaging

Eyndhoven

Batenburg

Kazantsev

et al. 2015

IEEE Trans. on Image Process.

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Abstract-The study of fluid flow through solid matter by computed tomography (CT) imaging has many applications, ranging from petroleum and aquifer engineering to biomedical, manufacturing and environmental research. To avoid motion artifacts, current experiments are often limited to slow fluid flow dynamics. This severely limits the applicability of the technique.In this paper, a new iterative CT reconstruction algorithm for improved temporal/spatial resolution in the imaging of fluid flow through solid matter is introduced. The proposed algorithm exploits prior knowledge in two ways. Firstly, the time-varying object is assumed to consist of stationary (the solid matter) and dynamic regions (the fluid flow). Secondly, the attenuation curve of a particular voxel in the dynamic region is modeled by a piecewise constant function over time, which is in accordance with the actual advancing fluid/air boundary.Quantitative and qualitative results on different simulation experiments and a real neutron tomography dataset show that, in comparison to state-of-the-art algorithms, the proposed algorithm allows reconstruction from substantially fewer projections per rotation without image quality loss. Therefore, temporal resolution can be substantially increased and thus fluid flow experiments with faster dynamics can be performed.

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Section: B Reconstruction Methodsmentioning

confidence: 99%

An Iterative CT Reconstruction Algorithm for Fast Fluid Flow Imaging

Eyndhoven

Batenburg

Kazantsev

et al. 2015

IEEE Trans. on Image Process.

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“…The tomography projections for attenuation and dark field were reconstructed with SIRT (ASTRA toolbox) [21]. The dark-field projections were reconstructed as (1 -dark-field) to set the air-region around the sample to zero.…”

Section: Neutron Interferometry Analysismentioning

confidence: 99%

Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry

Brooks

Kirka

et al. 2017

Prog Addit Manuf

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A high-resolution neutron tomography system and a grating-based interferometer are used to explore electron beam-melted titanium test objects. The high-resolution neutron tomography system (attenuation-based imaging) has a pixel size of 6.4 lm, appropriate for detecting voids near 25 lm over a (1.5 cm) 3 volume. The neutron interferometer provides dark-field (small-angle scattering) images with a pixel size of 30 lm. Moreover, the interferometer can be tuned to a scattering length, in this case, 1.97 lm, with a field-of-view of (6 cm) 3 . The combination of high-resolution imaging with grating-based interferometry provides a way for nondestructive testing of defective titanium samples. A chimney-like pore structure was discovered in the attenuation and dark-field images along one face of an electron beam-melted (EBM) Ti-6Al-4V cube. Tomographic reconstructions of the titanium samples are utilized as a source for a binary volume and for skeletonization of the pores. The dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.

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“…The reduction of the interferograms to projections of attenuation, differential phase contrast, and dark-field (small angle scattering) images was done with a vectorized least square algorithm [17]. The tomography projections were reconstructed with the Advanced Photon Source "TomoPy" package, including the simultaneous iterative reconstruction technique (SIRT) (ASTRA toolbox) [18].…”

Section: Neutron Interferometry and Tomographymentioning

confidence: 99%

Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering

et al. 2017

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Abstract:A novel neutron far field interferometer is explored for sub-micron porosity detection in laser sintered stainless steel alloy 316 (SS316) test objects. The results shown are images and volumes of the first quantitative neutron dark-field tomography at various autocorrelation lengths, ξ. In this preliminary work, the beam defining slits were adjusted to an uncalibrated opening of 0.5 mm horizontal and 5 cm vertical; the images are blurred along the vertical direction. In spite of the blurred attenuation images, the dark-field images reveal structural information at the micron-scale. The topics explored include: the accessible size range of defects, potentially 338 nm to 4.5 µm, that can be imaged with the small angle scattering images; the spatial resolution of the attenuation image; the maximum sample dimensions compatible with interferometry optics and neutron attenuation; the procedure for reduction of the raw interferogram images into attenuation, differential phase contrast, and small angle scattering (dark-field) images; and the role of neutron far field interferometry in additive manufacturing to assess sub-micron porosity.

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The ASTRA Toolbox: A platform for advanced algorithm development in electron tomography

Cited by 755 publications

References 33 publications

An Iterative CT Reconstruction Algorithm for Fast Fluid Flow Imaging

An Iterative CT Reconstruction Algorithm for Fast Fluid Flow Imaging

Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry

Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering

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