TY - CONF T1 - Comparison Radiography and Tomography Possibilities of FRM-II (20 MW) and Budapest (10 MW) Research Reactor T2 - Proceedings of the Eight World Conference WCNR-8 Y1 - 2008 A1 - Márton Balaskó A1 - Attila Kuba A1 - Attila Tanacs A1 - Zoltán Kiss A1 - Antal Nagy A1 - Burkhard Schillinger ED - Muhammed Arif JF - Proceedings of the Eight World Conference WCNR-8 ER - TY - CONF T1 - Study of the Inner Structure of a Damaged Control Rod by Neutron and X-ray Radiography and Discrete Tomography T2 - Proceedings of the Eight World Conference WCNR-8 Y1 - 2008 A1 - Márton Balaskó A1 - Erzsébet Sváb A1 - Zoltán Kiss A1 - Attila Tanacs A1 - Antal Nagy A1 - Attila Kuba ED - Muhammed Arif JF - Proceedings of the Eight World Conference WCNR-8 ER - TY - CHAP T1 - Discrete Tomography Methods for Nondestructive Testing. T2 - Advances in Discrete Tomography and Its Applications Y1 - 2007 A1 - Joachim Baumann A1 - Zoltán Kiss A1 - Sven Krimmel A1 - Attila Kuba A1 - Antal Nagy A1 - Lajos Rodek A1 - Burkhard Schillinger A1 - Juergen Stephan ED - Gábor T Herman ED - Attila Kuba AB -

The industrial nondestructive testing (NDT) of objects seems to be an ideal application of discrete tomography. In many cases, the objects consist of known materials, and a lot of a priori information is available (e.g., the description of an ideal object, which is similar to the actual one under investigation). One of the frequently used methods in NDT is to take projection images of the objects by some transmitting ray (e.g., X- or neutron-ray) and reconstruct the cross sections. But it can happen that only a few number of projections can be collected, because of long and/or expensive data acquisition, or the projections can be collected only from a limited range of directions. The chapter describes two DT reconstruction methods used in NDT experiments, shows the results of a DT procedure applied in the reconstruction of oblong objects having projections only from a limited range of angles, and, finally, suggests a few further possible NDT applications of DT.

 

JF - Advances in Discrete Tomography and Its Applications T3 - Applied and Numerical Harmonic Analysis PB - Birkhauser SN - 978-0-8176-3614-2 N1 - doi: 10.1007/978-0-8176-4543-4_14 ER - TY - JOUR T1 - Image reconstruction and correction methods in neutron and X-ray tomography JF - Acta Cybernetica Y1 - 2006 A1 - Zoltán Kiss A1 - Lajos Rodek A1 - Attila Kuba AB -

Neutron and X-ray tomography are imaging techniques for getting information about the interior of objects in a non-destructive way. They reconstruct cross-sections from projection images of the object being investigated. Due to the properties of the image acquisition system, the projection images are distorted by several artifacts, and these reduce the quality of the reconstruction. In order to eliminate these harmful effects the projection images should be corrected before reconstruction. Taking projections is usually an expensive and time consuming procedure. One of our main goals has been to try to minimize the number of projections - for example, by exploiting more a priori information. A possible way of reducing the number of projections is by the application of discrete tomographic methods. In this case a special class of objects can be reconstructed, consisting of only a few homogenous materials that can be characterized by known discrete absorption values. To this end we have implemented two reconstruction methods. One is able to reconstruct objects consisting of cylinders and spheres made of homogeneous materials only. The other method is a general one in the sense that it can be used for reconstructing any shape. Simulations on phantoms and physical measurements were carried out and the results are presented here.

PB - University of Szeged CY - Szeged, Hungary VL - 17 ER - TY - JOUR T1 - Discrete Reconstruction Techniques JF - ELECTRONIC NOTES IN DISCRETE MATHEMATICS Y1 - 2005 VL - 20 SN - 1571-0653 N1 - doi: 10.1016/j.endm.2005.04.005 JO - ELECTRON NOTES DISCRETE MATH ER - TY - JOUR T1 - Discrete tomography for reconstruction from limited view angles in non-destructive testing. JF - ELECTRONIC NOTES IN DISCRETE MATHEMATICS Y1 - 2005 VL - 20 SN - 1571-0653 IS - 1 N1 - doi: 10.1016/j.endm.2005.05.078 JO - ELECTRON NOTES DISCRETE MATH ER - TY - JOUR T1 - Discrete tomography in neutron radiography JF - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A- ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Y1 - 2005 VL - 542 SN - 0168-9002 IS - 1-3 N1 - UT: 000229295300061ScopusID: 17644402754doi: 10.1016/j.nima.2005.01.164 JO - NUCL INSTRUM METH A ER - TY - JOUR T1 - Neutron-, gamma- and X-ray three-dimensional computed tomography at the Budapest research reactor site. JF - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A- ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Y1 - 2005 VL - 542 SN - 0168-9002 IS - 1-3 N1 - UT: 000229295300005ScopusID: 17644421794doi: 10.1016/j.nima.2005.01.006 JO - NUCL INSTRUM METH A ER - TY - JOUR T1 - Pipe corrosion and deposit study using neutron- and gamma- radiation sources. JF - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A- ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Y1 - 2005 VL - 542 SN - 0168-9002 IS - 1-3 N1 - UT: 000229295300050ScopusID: 17644425255doi: 10.1016/j.nima.2005.01.153 JO - NUCL INSTRUM METH A ER - TY - JOUR T1 - Preliminary studies of discrete tomography in neutron imaging JF - IEEE Transactions on Nuclear Science Y1 - 2005 A1 - Atila Kuba A1 - László Ruskó A1 - Lajos Rodek A1 - Zoltán Kiss AB -

Discrete tomography (DT) is a new technique to reconstruct discrete images from their projections (like neutron images). The reconstruction methods in DT are different from the conventional ones, because the created images may contain only a few numbers of given discrete values. One of the main reasons to apply DT is that hopefully we need only a few numbers of projections. In many applications we have a situation where we know the material components of the object to be studied, that is, we know the discrete values of the image to be reconstructed. Using discreteness and some a priori information we can apply several DT methods in neutron imaging. Most of the DT reconstruction methods are reducing the problem to an optimization task. We tried two such methods on software and physical phantoms. In these experiments we investigated the effects of the following parameters: number of projections, noise levels, and complexity of the object to be reconstructed. We also developed a software system, called DIRECT, for testing different DT methods, to compare them and to present the reconstructed objects.

PB - IEEE VL - 52 ER - TY - JOUR T1 - Reconstruction of pixel-based and geometric objects by discrete tomography. Simulation and physical experiments JF - ELECTRONIC NOTES IN DISCRETE MATHEMATICS Y1 - 2005 VL - 20 SN - 1571-0653 N1 - ScopusID: 34247162343doi: 10.1016/j.endm.2005.05.080 JO - ELECTRON NOTES DISCRETE MATH ER -