00711nas a2200181 4500008003900000245011200039210006900151260001200220300001200232100002200244700001700266700001900283700001800302700001600320700002600336700001900362856014800381 2008 d00aComparison Radiography and Tomography Possibilities of FRM-II (20 MW) and Budapest (10 MW) Research Reactor0 aComparison Radiography and Tomography Possibilities of FRMII 20 cOctober a18–271 aBalaskó, Márton1 aKuba, Attila1 aTanacs, Attila1 aKiss, Zoltán1 aNagy, Antal1 aSchillinger, Burkhard1 aArif, Muhammed uhttps://www.inf.u-szeged.hu/publication/comparison-radiography-and-tomography-possibilities-of-frm-ii-20-mw-and-budapest-10-mw-research-reactor00718nas a2200181 4500008003900000245011500039210006900154260001200223300001400235100002200249700002100271700001800292700001900310700001600329700001700345700001900362856015500381 2008 d00aStudy of the Inner Structure of a Damaged Control Rod by Neutron and X-ray Radiography and Discrete Tomography0 aStudy of the Inner Structure of a Damaged Control Rod by Neutron cOctober a294–3031 aBalaskó, Márton1 aSváb, Erzsébet1 aKiss, Zoltán1 aTanacs, Attila1 aNagy, Antal1 aKuba, Attila1 aArif, Muhammed uhttps://www.inf.u-szeged.hu/publication/study-of-the-inner-structure-of-a-damaged-control-rod-by-neutron-and-x-ray-radiography-and-discrete-tomography01832nas a2200241 4500008004100000020002200041245006000063210005900123260002100182300001400203520108200217100002101299700001801320700001801338700001701356700001601373700001701389700002601406700002101432700002101453700001701474856009901491 2007 eng d a978-0-8176-3614-200aDiscrete Tomography Methods for Nondestructive Testing.0 aDiscrete Tomography Methods for Nondestructive Testing bBirkhauserc2007 a303 - 3323 a
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.
1 aBaumann, Joachim1 aKiss, Zoltán1 aKrimmel, Sven1 aKuba, Attila1 aNagy, Antal1 aRodek, Lajos1 aSchillinger, Burkhard1 aStephan, Juergen1 aHerman, Gábor T1 aKuba, Attila uhttps://www.inf.u-szeged.hu/publication/discrete-tomography-methods-for-nondestructive-testing01950nas a2200157 4500008004100000245008100041210006900122260004200191300001200233490000700245520136800252100001801620700001701638700001701655856012001672 2006 eng d00a Image reconstruction and correction methods in neutron and X-ray tomography0 aImage reconstruction and correction methods in neutron and Xray aSzeged, HungarybUniversity of Szeged a557-5870 v173 a
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.
1 aKiss, Zoltán1 aRodek, Lajos1 aKuba, Attila uhttps://www.inf.u-szeged.hu/publication/image-reconstruction-and-correction-methods-in-neutron-and-x-ray-tomography00484nas a2200169 4500008004100000020001400041245003900055210003900094260000900133300001400142490000700156100001700163700002100180700001800201700001600219856007900235 2005 eng d a1571-065300aDiscrete Reconstruction Techniques0 aDiscrete Reconstruction Techniques c2005 a385 - 3980 v201 aKuba, Attila1 aRuskó, László1 aKiss, Zoltán1 aNagy, Antal uhttps://www.inf.u-szeged.hu/publication/discrete-reconstruction-techniques00690nas a2200193 4500008004100000020001400041245009600055210006900151260000900220300001400229490000700243100001800250700002100268700001800289700001700307700001600324700002100340856013500361 2005 eng d a1571-065300aDiscrete tomography for reconstruction from limited view angles in non-destructive testing.0 aDiscrete tomography for reconstruction from limited view angles c2005 a455 - 4740 v201 aKrimmel, Sven1 aBaumann, Joachim1 aKiss, Zoltán1 aKuba, Attila1 aNagy, Antal1 aStephan, Juergen uhttps://www.inf.u-szeged.hu/publication/discrete-tomography-for-reconstruction-from-limited-view-angles-in-non-destructive-testing00572nas a2200193 4500008004100000020001400041245004700055210004700102260000900149300001400158490000800172100001700180700001700197700001800214700002100232700002200253700001600275856008700291 2005 eng d a0168-900200aDiscrete tomography in neutron radiography0 aDiscrete tomography in neutron radiography c2005 a376 - 3820 v5421 aKuba, Attila1 aRodek, Lajos1 aKiss, Zoltán1 aRuskó, László1 aBalaskó, Márton1 aNagy, Antal uhttps://www.inf.u-szeged.hu/publication/discrete-tomography-in-neutron-radiography00710nas a2200193 4500008004100000020001400041245010800055210006900163260000900232300001200241490000800253100002200261700001700283700001600300700001800316700001700334700002100351856014400372 2005 eng d a0168-900200aNeutron-, gamma- and X-ray three-dimensional computed tomography at the Budapest research reactor site.0 aNeutron gamma and Xray threedimensional computed tomography at t c2005 a22 - 270 v5421 aBalaskó, Márton1 aKuba, Attila1 aNagy, Antal1 aKiss, Zoltán1 aRodek, Lajos1 aRuskó, László uhttps://www.inf.u-szeged.hu/publication/neutron-gamma-and-x-ray-three-dimensional-computed-tomography-at-the-budapest-research-reactor-site00661nas a2200193 4500008004100000020001400041245008200055210006900137260000900206300001400215490000800229100002200237700002100259700001700280700001800297700001700315700001600332856011900348 2005 eng d a0168-900200aPipe corrosion and deposit study using neutron- and gamma- radiation sources.0 aPipe corrosion and deposit study using neutron and gamma radiati c2005 a302 - 3080 v5421 aBalaskó, Márton1 aSváb, Erzsébet1 aKuba, Attila1 aKiss, Zoltán1 aRodek, Lajos1 aNagy, Antal uhttps://www.inf.u-szeged.hu/publication/pipe-corrosion-and-deposit-study-using-neutron-and-gamma-radiation-sources01692nas a2200169 4500008004100000245006600041210006600107260001500173300001200188490000700200520113700207100001601344700002101360700001701381700001801398856010601416 2005 eng d00aPreliminary studies of discrete tomography in neutron imaging0 aPreliminary studies of discrete tomography in neutron imaging bIEEEc2005 a380-3850 v523 aDiscrete 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.
1 aKuba, Atila1 aRuskó, László1 aRodek, Lajos1 aKiss, Zoltán uhttps://www.inf.u-szeged.hu/publication/preliminary-studies-of-discrete-tomography-in-neutron-imaging00697nas a2200181 4500008004100000020001400041245011600055210006900171260000900240300001400249490000700263100001800270700001700288700001600305700001700321700002200338856015500360 2005 eng d a1571-065300aReconstruction of pixel-based and geometric objects by discrete tomography. Simulation and physical experiments0 aReconstruction of pixelbased and geometric objects by discrete t c2005 a475 - 4910 v201 aKiss, Zoltán1 aRodek, Lajos1 aNagy, Antal1 aKuba, Attila1 aBalaskó, Márton uhttps://www.inf.u-szeged.hu/publication/reconstruction-of-pixel-based-and-geometric-objects-by-discrete-tomography-simulation-and-physical-experiments