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Evaluation of influencing factors in dual energy X-ray imaging

: Ennen, Alexander; Firsching, Markus; Mühlbauer, Jörg; Bierl, Daniel; Schmitt, Michael; Voland, Virginia

Brno University of Technology:
11th European Conference on Non-Destructive Testing, ECNDT 2014. Book of Abstracts : October 6-10, 2014, Prague, Czech Republic
Brno: Brno University of Technology, 2014
ISBN: 978-80-214-5019-6
European Conference on Nondestructive Testing (ECNDT) <11, 2014, Prague>
Fraunhofer IIS ()
Visualisierungform; Röntgentechnologie; Röntgentechnik; Röntgen - Bildverarbeitung; Dual-Energy; Computer-Tomografie (CT); 2D

Dual Energy X-ray imaging has proven to be a worthwhile method to acquire quantitative material characteristics from radiographic images and computed tomography (CT) scans. In contrast to conventional X-ray imaging it provides quantitative information (e.g. the areal density) about the scanned material. Fraunhofer EZRT’s Dual Energy technique provides the areal density of two given materials, which are necessary a-priori information. Although this technique is performed on radioscopic data it can also be used to process Dual Energy computed tomography (CT) data. For Dual Energy CT measurements, there is a wide variety of influences that may reduce the precision of the calculated results (areal density of the previously chosen materials), as for example, the scattering of X-rays (detector internal scattering and object scattering) or the inherent filtering of the X-ray source. To evaluate the influence of these factors on the precision of the responding areal density measurement tasks are presented and discussed.