TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Deresch, Andreas A1 - Bellon, Carsten A1 - Schumm, A. A1 - Lucet-Sanchez, F. A1 - Guerin, P. ED - Chimenti, D.E. ED - Bond, L.J. T1 - Radiography benchmark 2014 N2 - The purpose of the 2014 WFNDEC RT benchmark study was to compare predictions of various models of radiographic techniques, in particular those that predict the contribution of scattered radiation. All calculations were carried out for homogenous materials and a mono-energetic X-ray point source in the energy range between 100 keV and 10 MeV. The calculations were to include the best physics approach available considering electron binding effects. Secondary effects like X-ray fluorescence and bremsstrahlung production were to be taken into account if possible. The problem to be considered had two parts. Part I examined the spectrum and the spatial distribution of radiation behind a single iron plate. Part II considered two equally sized plates, made of iron and aluminum respectively, only evaluating the spatial distribution. Here we present the results of above benchmark study, comparing them to MCNP as the assumed reference model. The possible origins of the observed deviations are discussed. T2 - 41st Annual review of progress in quantitative nondestructive evaluation CY - Boise, Idaho, USA DA - 20.07.2014 KW - Radiography KW - Spectrum KW - Modeling KW - Validation PY - 2015 SN - 978-0-7354-1292-7 DO - https://doi.org/10.1063/1.4914809 N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings VL - 1650 SP - 1834 EP - 1846 PB - AIP Publishing AN - OPUS4-33083 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Deresch, Andreas A1 - Bellon, Carsten A1 - Jaenisch, Gerd-Rüdiger A1 - Ewert, Uwe ED - Chimenti, D.E. ED - Bond, L.J. T1 - Fast model of electron transport for radiographic spectrum simulation N2 - Correctly modeling the continuous photon spectrum of X-ray tubes requires detailed knowledge of the probability distribution of electron properties at the time of X-ray photon creation, in particular electron energy, depth within the target, and direction of movement. Semi-analytical X-ray spectrum models frequently assume a very simplified or even uniform distribution of electron direction. In the case of thick targets and small deviations from normal incidence this is a useful approximation. For thin targets or large deviations from normal incidence the correct distribution of electron directions becomes more important. As calculation speed is an important aspect of semi-analytical models compared to Monte Carlo simulations, fast evaluation of the distribution of electron properties is highly desirable. The approach presented here numerically evaluates the evolution of a discrete probability distribution of electron properties due to single electron scatter interactions within a plane target. This allows capturing the important aspects of the electron distribution while achieving runtimes of a few seconds up to a minute on a standard office PC. T2 - 41st Annual review of progress in quantitative nondestructive evaluation CY - Boise, Idaho, USA DA - 20.07.2014 KW - Radiography KW - Spectrum KW - Modeling KW - Valildation PY - 2015 SN - 978-0-7354-1292-7 DO - https://doi.org/10.1063/1.4914656 N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings VL - 1650 SP - 579 EP - 585 PB - AIP Publishing AN - OPUS4-33082 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger T1 - Modelling Radiological Methods with aRTist Based on Analytical and Monte Carlo Methods T2 - Annual Conference of the British Institute of NDT - Materials Testing 2015 CY - Telford, UK DA - 2015-09-08 PY - 2015 AN - OPUS4-33276 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bellon, Carsten A1 - Deresch, Andreas A1 - Jaenisch, Gerd-Rüdiger T1 - Radiography simulation with aRTist - Combining analytical and Monte Carlo methods N2 - Modelling becomes more and more important in modern NDE. It is increasingly used to optimize techniques for complex applications and to support the preparation of written procedures. Hence, computer simulation nowadays has to be able to handle all significant properties of an NDE system with sufficient accuracy. In case of radiographic applications this includes models of the radiation source, of the interaction of radiation with materials, of the detection process, and the geometrical description of the part or the construction. Depending on the given inspection problem and the influencing factors that should be addressed by the simulation an appropriate physical model has to be chosen to describe the underlying interaction mechanisms. The simulator aRTist combines analytical and Monte Carlo methods to efficiently model the radiation transport. Simulation is a powerful tool to separate different influencing factors. Here we focus on Monte-Carlo simulation of scatter contributions within aRTist. T2 - DIR 2015 - International symposium on digital industrial radiology and computed tomography CY - Ghent, Belgium DA - 22.06.2015 KW - CT KW - Multi-angle radiography KW - Modelling KW - Laminography KW - Radiographic testing (RT) PY - 2015 SP - 1 EP - 7 AN - OPUS4-33738 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Jaenisch, Gerd-Rüdiger A1 - Kardjilov, N. A1 - Tötzke, C. A1 - Markötter, Henning A1 - Hilger, A. A1 - Manke, I. T1 - Compton-CT als Alternative zur Neutronentomographie? N2 - Als Alternative zur Neutronentomographie wird das Potenzial der Computertomographie (CT) mit inkohärenter Röntgen-Streustrahlung (Compton-Streuung) untersucht. Die gleichzeitige Abbildung von Materialien sehr unterschiedlicher Dichten (Ordnungszahlen) ist eine wiederkehrende Herausforderung für die Radiologie und die Computertomographie mit Röntgenstrahlung. Die Messungen ergeben asymmetrische Projektionsprofile für Sinogramme der Streuintensität. Am Beispiel verschiedener Polymere (Polyethylen, Polyamid, PVC), Glas und Holz wird in den Tomogrammen ein hochaufgelöster 'Comptonkontrast' vergleichbarer Dynamik erreicht, während der simultan gemessene 'Absorptionskontrast' ausschließlich die starken Absorber (Glas und PVC) zeigt. Der Vergleich mit ähnlich auflösender Neutronentomographie zeigt ähnliche Kontraste und eröffnet mithin die Möglichkeit, diese künftig durch Compton-Tomographie im Labormaßstab zu ersetzen. T2 - DACH-Jahrestagung 2015 CY - Salzburg, Austria DA - 11.05.2015 KW - Comptonstreuung KW - Computertomographie KW - Neutronentomographie PY - 2015 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-342894 SN - 978-3-940283-68-9 IS - DGZfP BB 152 SP - Mo.3.A.2, 1 EP - 10 AN - OPUS4-34289 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kupsch, Andreas A1 - Lange, Axel A1 - Hentschel, Manfred P. A1 - Jaenisch, Gerd-Rüdiger A1 - Kardjilov, N. A1 - Tötzke, C. A1 - Markötter, Henning A1 - Hilger, A. A1 - Manke, I. T1 - X-ray compton line scan tomography N2 - The potentials of incoherent X-ray scattering (Compton) computed tomography (CT) are investigated. The imaging of materials of very different atomic number or density at once is generally a perpetual challenge for X-ray tomography or radiography. In a basic laboratory set-up for simultaneous perpendicular Compton scattering and direct beam attenuation tomography are conducted by single channel photon counting line scans. This results in asymmetric distortions of the projection profiles of the scattering CT data set. In a first approach, corrections of Compton scattering data by taking advantage of rotational symmetry yield tomograms without major geometric artefacts. A cylindrical sample composed of PE, PA, PVC, glass and wood demonstrates similar Compton contrast for all the substances, while the conventional absorption tomogram only reveals the two high order materials. Comparison to neutron tomography reveals astonishing similarities except for the glass component (without hydrogen). Therefore, Compton CT offers the potential to replace neutron tomography, which requires much more efforts. KW - X-ray compton scattering KW - Computed tomography KW - Neutron tomography PY - 2015 DO - https://doi.org/10.3139/120.110799 SN - 0025-5300 VL - 57 IS - 11-12 SP - 985 EP - 991 PB - Hanser CY - München AN - OPUS4-34963 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Janczynski, Jessica A1 - Bellon, Carsten A1 - Ulbricht, Alexander T1 - VIRTUELLE XCT – Simulation industrieller XCT-Systeme mit aRTist N2 - Eine der wenigen 3D-Methoden, mit denen ein Objekt zerstörungsfrei analysiert werden kann, ist die Röntgen-Computertomographie (XCT). Die Bestimmung von Formabweichungen und die innere Struktur von Objekten, einschließlich Defekten, ist für die Industrie von besonderem Interesse. Die Möglichkeit der XCT, ein Objekt mit seinen inneren und äußeren Strukturen gleichzeitig abzubilden, führt auch zu einer zunehmenden Anwendung der XCT in der dimensionellen Messtechnik einschließlich der Bestimmung der Messunsicherheit. Die experimentelle Ermittlung der Unsicherheit durch wiederholte XCT-Messungen ist kosten- und zeitintensiv. Die Simulation der XCT eröffnet die Möglichkeit, die aufgabenspezifische Messunsicherheit ressourceneffizient numerisch zu ermitteln. Es gibt bereits mehrere Softwarelösungen, die XCT-Systeme simulieren können, wie z. B. aRTist. Sobald ein XCT-System virtuelle nachgebildet wurde, muss seine Genauigkeit quantitativ im Vergleich zu den XCT-Messungen bewertet werden. Zur Bewertung der Qualität simulierter XCT-Bilder werden verschiedene Metriken für den Vergleich experimenteller und simulierter XCT-Projektionen eingeführt. Die Ergebnisse der Vergleiche werden präsentiert und Schlussfolgerungen gezogen, wie die Simulation industrieller XCT-Systeme verbessert werden kann. T2 - DGZfP-Jahrestagung 2025 CY - Berlin, Germany DA - 26.05.2025 KW - XCT KW - Simulation KW - Vergleich Messung vs. Simulation PY - 2015 AN - OPUS4-63293 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -