X-ray computed laminography: an approach of computed tomography for applications with limited access

Gondrom, Sven; Zhou, Jianxun; Maisl, Michael; Reiter, H.; Kröning, M.; Arnold, W.

doi:10.1016/s0029-5493(98)00319-7

Cited by 92 publications

(50 citation statements)

References 4 publications

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“…It had been developed into a computer tomography (CT) method (155), but this was rarely used. The increasing availability of synchrotron X-ray sources, however, may change this in the future (139,156).…”

Section: Penetrating Radiation Test Methodsmentioning

confidence: 99%

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner

Hack

Neuenschwander

2015

Encyclopedia of Polymer Science and Technology

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Because of their unique properties, polymers and polymer–matrix composites pose both challenges and opportunities for nondestructive testing. The increasing use of these materials creates a demand for nondestructive verification of various properties or specifications, determination of structural integrity, or prediction of service‐life. On the other hand, development of new nondestructive test methods, improved sensitivity, or faster data acquisition and analysis may allow for nondestructive testing applications that hitherto did not seem feasible or economical. This article provides a brief overview of established methods and emerging applications in nondestructive testing of polymers and polymer–matrix composites.

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Section: Penetrating Radiation Test Methodsmentioning

confidence: 99%

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Brunner

Hack

Neuenschwander

2015

Encyclopedia of Polymer Science and Technology

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“…In addition, local tomography with limited angle range delivers an image with anisotropic resolution. Reference [8] points out the fact that limited angle range tomography is equivalent to laminography, and the samples presented there clearly show the anisotropic resolution and distorted representation of cracks. Figure 2 shows an area of 27 × 27 mm 2 (cell 52) that has been found to be representative for the whole cell.…”

Section: Radiography and Local Tomography Of A Nio-ysz Pelletmentioning

confidence: 98%

Application of Non‐Destructive Testing to Analyse SOFC Cells and Stacks

2009

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Assuring high level of manufacturing quality and understanding degradation and ageing phenomena is a key requirement for the SOFC technology. In order to analyse structural failures in SOFC cells and stacks, electron and optical microscopy as well as chemical analysis require the destruction of cells and stacks in order to access the relevant structural areas. Non‐destructive test methods like thermography and radiography can assist in identifying the so‐called ‘hidden defects' in cells for both, quality assurance during production and identifying relevant areas for further destructive post mortem analysis. The evaluation of these non‐destructive test methods showed that useful information can be obtained with standard equipment, and the resolution limits have been identified. Combination of both thermography and radiography was applied to identify pores and other irregularities in the range of 10–100 μ. Pores in the vicinity of the cathode/electrolyte interface were observed by X‐ray tomography.

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“…Applications featuring flat samples, where one dimension is much smaller than others, include finding defects in microchips, rotor blades for wind energy plants, or the analysis of fossils, where samples must not be destroyed. Especially for these areas of application, where CT has severe drawbacks, a technique called Computed Laminography (CL) has been developed [1][2][3][4][5][6]. Hereby, X-ray images are generated using a specific geometry like the CLARA setup [3,7].…”

Section: P Trampert Et Al / Spherically Symmetric Volume Elements Amentioning

confidence: 99%

“…Especially for these areas of application, where CT has severe drawbacks, a technique called Computed Laminography (CL) has been developed [1][2][3][4][5][6]. Hereby, X-ray images are generated using a specific geometry like the CLARA setup [3,7]. In this setup, X-ray source and detector are initially rotated by a fixed angle around the horizontal rotation axis (z-axis).…”

Section: P Trampert Et Al / Spherically Symmetric Volume Elements Amentioning

confidence: 99%

Spherically symmetric volume elements as basis functions for image reconstructions in computed laminography

Trampert

Vogelgesang

Schorr

et al. 2017

Journal of X-Ray Science and Technology: Clinical Applications

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Abstract. BACKGROUND:Laminography is a tomographic technique that allows three-dimensional imaging of flat, elongated objects that stretch beyond the extent of a reconstruction volume. Laminography datasets can be reconstructed using iterative algorithms based on the Kaczmarz method. OBJECTIVE: The goal of this study is to develop a reconstruction algorithm that provides superior reconstruction quality for a challenging class of problems. METHODS: Images are represented in computer memory using coefficients over basis functions, typically piecewise constant functions (voxels). By replacing voxels with spherically symmetric volume elements (blobs) based on generalized KaiserBessel window functions, we obtained an adapted version of the algebraic reconstruction technique. RESULTS: Band-limiting properties of blob functions are beneficial particular in the case of noisy projections and if only a limited number of projections is available. In this case, using blob basis functions improved the full-width-at-half-maximum resolution from 10.2 ± 1.0 to 9.9 ± 0.9 (p value = 2.3·10 −4 ). For the same dataset, the signal-to-noise ratio improved from 16.1 to 31.0. The increased computational demand per iteration is compensated for by a faster convergence rate, such that the overall performance is approximately identical for blobs and voxels. CONCLUSIONS: Despite the higher complexity, tomographic reconstruction from computed laminography data should be implemented using blob basis functions, especially if noisy data is expected.

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X-ray computed laminography: an approach of computed tomography for applications with limited access

Cited by 92 publications

References 4 publications

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Nondestructive Testing of Polymers and Polymer–Matrix Composites

Application of Non‐Destructive Testing to Analyse SOFC Cells and Stacks

Spherically symmetric volume elements as basis functions for image reconstructions in computed laminography

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