Region-of-interest microtomography for component inspection

Kalukin, Andrew R.; Keane, Denis T.; Roberge, W. G.

doi:10.1109/23.747765

Cited by 7 publications

(3 citation statements)

References 42 publications

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“…In zoom‐in tomography, low‐resolution data about the information outside the RoI is combined with the high‐resolution data within the RoI to produce a best estimate reconstruction (Nalcioglu et al , 1979; Ohyama et al , 1984; Gentle & Spyrou, 1990; Kalukin et al , 1999; Chun et al , 2004; Tisson et al , 2004; Xiao et al , 2007). These methods can be rather difficult to undertake experimentally and require very accurate registration of the low‐ and high‐resolution projections.…”

Section: Introductionmentioning

confidence: 99%

Region-of-interest tomography using filtered backprojection: assessing the practical limits

Kyrieleis

Titarenko

Ibison

et al. 2010

Journal of Microscopy

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SummaryThere are many cases where it is desirable to reconstruct at high resolution a small volume from a larger sample. Here we describe the outcomes of a reconstruction trial based on real samples aimed at delineating the practical limits to which a small region of interest can be viewed from a large sample. Our approach has been to artificially truncate the sinograms of whole sample scans to simulate region of interest tomography. A simple filtered back projection algorithm has been applied, with the sinograms extended laterally in a simple manner to make up for the truncated portions. The impact of the degree of truncation (from 0% down to 99%), the number of projections used, as well as the position of the region of interest, on the faithfulness of the reconstruction is evaluated for a range of sample types. We have assessed the nature of, and extent to which, artefacts are introduced and the degree to which simple strategies can minimize them to an acceptable level without the need for complex reconstruction algorithms, projection stitching strategies or very large detectors. It is found that for a wide range of objects the effect of truncation on feature detection is negligible and that excellent images can be reconstructed if the number of projections is calculated not on the basis of the number of pixels on the camera, but on the number of pixels that would be required to scan the whole sample at the chosen pixel resolution. This paper demonstrates that in many cases more sophisticated reconstruction strategies are not necessary.

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Section: Introductionmentioning

confidence: 99%

Region-of-interest tomography using filtered backprojection: assessing the practical limits

Kyrieleis

Titarenko

Ibison

et al. 2010

Journal of Microscopy

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“…For specimens with complex, highly anisotropic cross-sections or with high frequency, anisotropic internal structure, it is essential to ascertain the extent of artefacts. 171 A number of groups/facilities routinely use local tomography. In a custom built lab microCT system, local tomographic reconstruction compared well with reconstruction with the complete FOV.…”

Section: X-ray Microct Using Signals Other Than Absorption or Phasementioning

confidence: 99%

Recent advances in X-ray microtomography applied to materials

Stock

2008

International Materials Reviews

444

208

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This review highlights recent advances in X-ray microcomputed tomography (microCT) as applied to materials, specifically advances made since the first materials microCT review appeared in International Materials Reviews. 1 Improvements in instrumentation are covered, and one focus is microCT using phase (as opposed to absorption) contrast. Instead of grouping studies by disciplines, the reviewed reports are organised by type of application, specifically the study of the spatial distribution of phases, of cellular solids (including static and temporally evolving structures, fibrous network solids, mineralised tissues and biomedical applications), of channel structures, of deformation, fatigue and fracture, of processing and of corrosion and environmental interactions. Metrology applications are covered briefly, and several applications where microCT is combined with position resolved X-ray scattering are described in more detail. The accuracy of microCT reconstructions is discussed before data handling challenges are outlined. The review closes with speculations on the future directions of materials microCT.

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“…In spite of remarkable results obtained both with laboratory and synchrotron set-ups [1]- [3], inspection of laterally extended objects (e.g. circuit boards) with CT remains a problematic task in various industrial and scientific applications [4]. Even with monochromatic synchrotron radiation, the reconstructed images suffer from imaging artefacts [5] resulting from the nonuniform transmission due to a strongly varying object thickness (and thus beam intensity attenuation) for the different projection directions.…”

Section: Introductionmentioning

confidence: 99%

Efficient Volume Reconstruction for Parallel-Beam Computed Laminography by Filtered Backprojection on Multi-Core Clusters

Myagotin

Voropaev

Helfen

et al. 2013

IEEE Trans. on Image Process.

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Computed laminography (CL) was developed to use X-rays from synchrotron sources for high-resolution imaging of the internal structure of a flat specimen from a series of 2-D projection images. The projections are acquired by irradiation of the sample under different rotation angles where the object rotation axis is inclined with respect to the beam direction. This yields for laterally extended objects a more uniform average transmitted intensity during sample rotation compared with computed tomography (CT). The reconstruction problem of CL cannot be reduced to a data-efficient 2-D case (as for parallel-beam CT) since each single slice perpendicular to the rotation axis requires a 2-D region on the detector as input data for all projection directions. This paper describes a computationally efficient reconstruction procedure based on filtered backprojection (FBP) adapted to the CL acquisition geometry. From the Fourier slice theorem, we derive a framework for analytic image reconstruction and outline implementation details of the generic FBP algorithm. Different approaches reducing the reconstruction time by means of parallel and distributed computations are considered and evaluated.

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Region-of-interest microtomography for component inspection

Cited by 7 publications

References 42 publications

Region-of-interest tomography using filtered backprojection: assessing the practical limits

Region-of-interest tomography using filtered backprojection: assessing the practical limits

Recent advances in X-ray microtomography applied to materials

Efficient Volume Reconstruction for Parallel-Beam Computed Laminography by Filtered Backprojection on Multi-Core Clusters

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