Sinogram interpretability based CT artefact reduction for multi-material workpieces

Grozmani, Natalia; Chupina, D.; Montavon, Benjamin; Schmitt, Robert

doi:10.1080/10589759.2022.2091134

Cited by 2 publications

(2 citation statements)

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“…The voltage correlates to the maximum X-ray photon energy and the current to the spectrum intensity [7]. In the best-case scenario, the CT parameters are chosen according to the known geometry and material composition of the sample under investigation [8,9]. Resulting absorption profiles are recorded and stored in the form of projection images.…”

Section: Dmentioning

confidence: 99%

“…The resulting MSP-CT volume is a fusion of several conventional or single-spectrum CT measurements performed with different X-ray spectra (see Figure 1). These single-spectrum CT measurements are acquired with varying spectra of x-ray and fused before, after, or simultaneously with CT volume reconstruction [9]. Hence, MSP-CT offers a minimisation of CT artefacts and an increase in grey value contrasts, which may significantly improve mineral differentiation.…”

Section: Dmentioning

confidence: 99%

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Application of multispectral computed tomography for the characterisation of natural graphite

Krebbers¹,

Grozmani²,

Lottermoser³

et al. 2023

eJNDT

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The established mineralogical and chemical analysis methods for graphite ores require complex sample preparation. Moreover, they do not produce 3D images of the polymineralic rock structure and texture. The lack of 3D information can lead to an erroneous assessment of the quality-determining properties of graphite ores, such as graphite flake size (grain size), graphite flake size distribution, and impurities. Therefore, there is a need to obtain 3D information from graphite ores and concentrates. Industrial computed tomography (CT or single-spectrum CT) is a unique technique that enables the examination of rocks in the 3D regime. The challenge in CT analysis of ores is the different absorption properties of mineral phases present. Low X-ray tube generator voltages lead to pronounced artefacts (volume defects) if highly absorbing gangue phases (e.g. iron sulfides) are present. Therefore, high X-ray tube voltages must be applied. However, graphite and associated gangue minerals, as well as contained cracks and voids in the ore, can exhibit similar absorption properties at higher generator energies (above 120 kV). Multispectral CT (MSP-CT) measurements offer a minimisation of CT artefacts and an increase in grey value contrasts. This work investigates the application of the MSP-CT measurements, significantly improving mineral differentiation.

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Section: Dmentioning

confidence: 99%

Section: Dmentioning

confidence: 99%