Investigating the influence of workpiece placement on the uncertainty of measurements in industrial computed tomography

Grozmani, Natalia; Rhiannon, Schmitt,; Buratti, Andrea

doi:10.58286/23750

Cited by 1 publication

(3 citation statements)

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“…The methods can therefore easily be transferred to different devices and do not need experimental CT scans or simulations with full complexity. Cone-beam artefacts arising from missing data in the Radon space were considered for example by [8][9][10][11]. Grozmani et al [8] used a constant threshold angle between the surface normal vector and the rotation axis and therefore an approximation.…”

Section: Introductionmentioning

confidence: 99%

“…Cone-beam artefacts arising from missing data in the Radon space were considered for example by [8][9][10][11]. Grozmani et al [8] used a constant threshold angle between the surface normal vector and the rotation axis and therefore an approximation. In [9,10], a tool is presented which uses an exact criterion, but the underlying formula is not shown.…”

Section: Introductionmentioning

confidence: 99%

“…While in [12] and [13] the maximum penetration length over a full scan is minimised, in [9,10] additionally the average length and the stability of the results is considered. Grozmani et al [8] argue that the best orientation is the one which minimises the optimum photon energy. Effectively, the average penetration length is minimised in case of mono-material and a monochromatic spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Geometrically Derived Quality Criteria regarding Optimal Workpiece Orientation for Computed Tomography Measurements

Butzhammer¹,

Müller²,

Hausotte³

2020

eJNDT

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In the field of industrial Computed Tomography (CT), the orientation of the workpiece influences the local quality of the reconstructed volume data and therefore dimensional measurements. In the literature, different a priori criteria for an optimal orientation are proposed, which are purely based on the part and setup geometry. However, it is not evident to which extent they correlate with the measurement accuracy or how different quality parameters should be weighted, especially if a wider range of materials and therefore different artefact contributions should be covered. In this work, existing methods and criteria are compared and extended. In contrast to most existing investigations, different quality parameters are evaluated not only globally, but also restricted to relevant regions of interest (ROI). A straightforward derivation for an analytical determination of surface areas affected by cone-beam artefacts is presented. Results show that an ROI-based evaluation is important to find an optimal orientation for single measurands. The investigated quality parameter based on the prediction of surface areas which are affected by cone-beam artefacts was found to be applicable as exclusion criterion. This only holds true if the evaluation is restricted to relevant ROI surface areas, which should also be considered when evaluating the maximum X-ray penetration length as quality parameter. The correlation of the latter with resulting measurement deviations was found to depend on the measurement task.

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