TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Artemiev, Valentin M. A1 - Naumov, A. ED - Thompson, D. T1 - Dynamic image reconstruction for CT applications T2 - 27th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Ames, IA, USA DA - 2000-07-16 PY - 2000 SN - 1-563-96988-2 SN - 0743-0760 SN - 0094-243X N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings IS - 557 SP - 1(?) EP - 8(?) PB - American Institute of Physics CY - Melville, NY AN - OPUS4-946 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Vengrinovich, V. A1 - Zolotarev, S. A1 - Kuntsevich, A. ED - Thompson, D. T1 - New technique for 2D and 3D X-ray image restoration of pipes in service given a limited access for observation T2 - 27th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Ames, IA, USA DA - 2000-07-16 PY - 2000 SN - 1-563-96988-2 SN - 0743-0760 SN - 0094-243X N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings IS - 557 SP - 8 Seiten PB - American Institute of Physics CY - Melville, NY AN - OPUS4-947 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Gray, J. ED - Thompson, D. T1 - X-ray imaging methods over the last 25 years - new advances and capabilities N2 - The last 25 years have seen an explosion in the number of new x-ray based imaging methods and applications. In reviewing these new capabilities we see that the ability to generate improved data quality underlies a number of the major advances. Improvement in the quality of x-ray sources, in detector resolution and dynamic range, in data analysis methods both in image processing and in reconstruction techniques have yielded significant advances in image quality. In addition to the improved imaging hardware, the use of computers play a key role in extending capabilities in high speed computed tomography, in real time image enhancement, in automated defect recognition and in the development of accurate x-ray inspection simulations. The ability to generate information and to analyze the complexities introduced by typical inspection demands can quickly outstrip even today's computational resources. Developments in parallel computing and computer memory are beginning to managing the huge data volumes now routinely produced and open up a number of new applications. Some examples include high-resolution 3D-image generation with the capability to probe micron length scales, dual energy computed tomography providing improved airport security, materials characterization techniques providing new tool for process development, and x-ray image formation modeling. The ability to model the details of the generation of bremsstrahlung radiation and its interaction with the complex geometry of the object under consideration provide for the first time a means to determine and quantify the optimal parameters for an inspection. These advances over the last 25 years represent exciting time in x-ray imaging, the impact of which will be played out in the next decade. ©2001 American Institute of Physics. T2 - 27th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Ames, IA, USA DA - 2000-07-16 PY - 2001 SN - 1-563-96988-2 U6 - https://doi.org/10.1063/1.1373737 SN - 0743-0760 SN - 0094-243X N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings IS - 557 SP - 16 EP - 32 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-1192 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Bellon, Carsten ED - Thompson, D. O. T1 - Special Features in Radiography Accessed by 3D Monte Carlo Model N2 - Standard radiography simulators are based on the attenuation law complemented by built-up-factors (BUF) to describe the interaction of radiation with material. The assumption of BUF implies that scattered radiation reduces only the contrast in radiographic images but does not image object structures itself. This simplification holds for a wide range of applications like weld inspection as known from practical experience. But only a detailed description of the different underlying interaction mechanisms is capable to explain effects like mottling or others that every radiographer has experienced in practice. The application of the N-Particle Monte Carlo code MCNP is capable to handle primary and secondary interaction mechanisms contributing to the image formation process like photon interactions (absorption, incoherent and coherent scattering including electron-binding effects, pair production) and electron interactions (electron tracing including X-Ray fluorescence and Bremsstrahlung production). Additionally it opens up possibilities like the separation of influencing factors and the understanding of the functioning of intensifying screen used in film radiography. The paper intends to discuss the opportunities in applying the Monte Carlo method to investigate special features in radiography in terms of selected examples. It is important to note that the use of Monte Carlo methods is a laboratory type of technique for basic investigations because of the enormous computing power that is needed. For in-field applications such as for inspection planing simplified models are of much greater importance and increasingly in use. ©2003 American Institute of Physics T2 - 29th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Bellingham, WA, USA DA - 2002-07-14 PY - 2003 SN - 0-7354-00117-9 U6 - https://doi.org/10.1063/1.1570183 SN - 0743-0760 SN - 0094-243X N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. SP - 537 EP - 544 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-2777 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Samadurau, Uladzimir A1 - Artemiev, Valentin M. A1 - Naumov, A. ED - Thompson, D. O. T1 - Statistical Characterization of Multi-Phase Flow by Dynamic Tomography N2 - The paper presents a special reconstruction algorithm that is capable to monitor density differences in multi-phase flows. The flow cross section is represented as discrete dynamic random field. A fixed gray value is assigned to each flow phase characterizing the material property of the phase. The image model is given by a set of non-linear stochastic difference equations. The corresponding inversion task is not accessible by common tomographic techniques applying reconstruction algorithms like filtered backprojection or algebraic reconstruction technique (ART). The developed algorithm is based on the Kalman filter technique adapted to non-linear phenomena. The average velocity distribution together with the corresponding covariance matrix of the liquid flow through a pipe serves as prior information in statistical sense. To overcome the non-linearity in the process model as well as in the measurement model the statistical linearization technique is applied. Moreover the Riccati equation, giving the error covariance matrix, and the equation for the optimal gain coefficients can be solved in advance and later used in the filter equation. It turns out that the resulting reconstruction or filter algorithm is recursive, i.e. yielding the quasi-optimal solution to the formulated inverse problem at every reconstruction step by successively counting for the new information collected in the projections. The applicability of the developed algorithm is discussed in terms of characterizing or monitoring a multi-phase flow in a pipe. ©2003 American Institute of Physics T2 - 29th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Bellingham, WA, USA DA - 2002-07-14 PY - 2003 SN - 0-7354-00117-9 U6 - https://doi.org/10.1063/1.1570197 SN - 0743-0760 SN - 0094-243X N1 - Geburtsname von Jaenisch, Gerd-Rüdiger: Tillack, G.-R. - Birth name of Jaenisch, Gerd-Rüdiger: Tillack, G.-R. SP - 643 EP - 650 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-2778 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zhukovskiy, M. A1 - Podoliako, S. A1 - Jaenisch, Gerd-Rüdiger A1 - Bellon, Carsten A1 - Samadurau, Uladzimir ED - Thompson, D. T1 - Monte Carlo Simulation Tool with CAD Interface T2 - 32th Annual Review of Progress in Quantitative Nondestructive Evaluation CY - Brunswick, ME, USA DA - 2005-07-31 KW - Monte Carlo Simulation KW - Radiography KW - CAD PY - 2006 SN - 0-7354-0312-0 SN - 0743-0760 SN - 0094-243X N1 - Serientitel: AIP conference proceedings – Series title: AIP conference proceedings IS - 820 SP - 574 EP - 581 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-12436 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Bellon, Carsten A1 - Samadurau, Uladzimir A1 - Zhukovskiy, M. A1 - Podoliako, Serguei T1 - McRay - A Monte Carlo Model Coupled to CAD for Radiation Techniques T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - Monte Carlo Verfahren KW - CAD KW - Radiographie PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 8(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-13796 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Migoun, Nikolai A1 - Gnusin, Alexandr A1 - Stadthaus, Meinhard A1 - Jaenisch, Gerd-Rüdiger T1 - New Potentials of Penetrant Testing T2 - 9th European Conference on NDT CY - Berlin, Germany DA - 2006-09-25 KW - Eindringprüfung KW - Eindringmittel KW - Normung PY - 2006 SN - 3-931381-86-2 SP - 1(?) EP - 6(?) PB - European Federation for Non-Destructive Testing CY - Berlin AN - OPUS4-13797 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Bellon, Carsten A1 - Ewert, Uwe T1 - Simulation for high energy radiography and reliability assessment T2 - National Seminar on NDE of the Indian Society for Non-Destructive Testing CY - Kolkata, India DA - 2005-12-02 KW - Radiation techniques KW - Simulation KW - High-energy radiography KW - CAD PY - 2005 SP - 14 pages PB - Indian Society for Non-Destructive Testing CY - Kalkutta AN - OPUS4-11834 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Jaenisch, Gerd-Rüdiger A1 - Bellon, Carsten A1 - Samadurau, Uladzimir T1 - Are Monte Carlo models applicable to radiological techniques? T2 - National Seminar on NDE of the Indian Society for Non-Destructive Testing CY - Kolkata, India DA - 2005-12-02 KW - Radiation techniques KW - Scattered radiation KW - Monte Carlo simulation KW - CAD PY - 2005 SP - 11 pages PB - Indian Society for Non-Destructive Testing CY - Kalkutta AN - OPUS4-11835 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -