Müller A, Butzhammer L, Hausotte T (2019)
Publication Language: English
Publication Type: Conference contribution, Conference Contribution
Publication year: 2019
Publisher: Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V
City/Town: Berlin
Conference Proceedings Title: International Symposium on Digital Industrial Radiology and Computed Tomography
ISBN: 978-3-947971-06-0
Open Access Link: https://www.dir2019.com/portals/dir2019/bb/We.3.A.2.pdf
Common X-ray sources for industrial computed tomography (CT) exhibit a polychromatic spectrum. While the absorption of radiation by the measurement object is dependent on the X-ray energy, the commonly used reconstruction algorithms assume an absorption coefficient under monochromatic conditions. In the context of industrial CT, the material of a measurement object is oftentimes known, which makes the application of a linearizing beam hardening correction method possible for parts made out of a single material. In this work, we present an efficient setup and data processing pipeline to determine and manage experimental X-ray absorption models for mono material parts. This pipeline estimates the correlation between attenuation and penetration length using a cone shaped specimen and subsequently corrects the grey values of the projections of a measurement object of the same material as the specimen. In contrast to commonly used step wedges, the special specimen makes it possible to sample the absorption curve with a large number of grid points, while using a standard measurement operation mode for the CT system. The correction method makes it possible to measure the tooth flanks of a steel gear wheel, which could otherwise not be measured due to beam hardening artefacts.
APA:
Müller, A., Butzhammer, L., & Hausotte, T. (2019). Implementation of a beam hardening correction method for mono material parts using a linearization technique. In International Symposium on Digital Industrial Radiology and Computed Tomography. Fürth, DE: Berlin: Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V.
MLA:
Müller, Andreas, Lorenz Butzhammer, and Tino Hausotte. "Implementation of a beam hardening correction method for mono material parts using a linearization technique." Proceedings of the International Symposium on Digital Industrial Radiology and Computed Tomography, Fürth Berlin: Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.V, 2019.
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