Discrete tomography (DT) is a set of tools for reconstructing the inner structure of objects consisting of only few different homogeneous materials. We propose a new method for multivalued DT, which performs the reconstruction as an energy minimisation task. For this algorithm, we define an energy function that can mathematically formulate the reconstruction task, and design a novel optimisation process for approximating the minima of this energy function. We validate the algorithm by comparing its performance with other cutting-edge reconstruction algorithms from the literature. We show that our method can compete with the currently used reconstruction techniques and under certain circumstances (e.g. with a low number of projections, or when the projection data are affected by random noise) it can even outperform them.

1 aVarga, László Gábor1 aBalázs, Péter1 aNagy, Antal uhttps://build.sprocket.sed.hu/publication/discrete-tomographic-reconstruction-via-adaptive-weighting-of-gradient-descents01339nas a2200169 4500008004100000245006900041210006700110260001300177300001200190490000800202520075900210100002000969700002100989700002501010700002301035856011101058 2015 eng d00aA Measure of Directional Convexity Inspired by Binary Tomography0 aMeasure of Directional Convexity Inspired by Binary Tomography cOct 2015 a151-1670 v1413 aInspired by binary tomography, we present a measure of directional convexity of binary images combining various properties of the configuration of 0s and 1s in the binary image. The measure can be supported by proper theory, is easy to compute, and as shown in our experiments, behaves intuitively. The measure can be useful in numerous applications of digital image processing and pattern recognition, and especially in binary tomography. We show in detail an application of this latter one, by providing a novel reconstruction algorithm for almost hv-convex binary images. We also present experimental results and mention some of the possible generalizations of the measure.

1 aBalázs, Péter1 aOzsvár, Zoltán1 aTasi, Tamás Sámuel1 aNyúl, László, G uhttps://build.sprocket.sed.hu/publication/a-measure-of-directional-convexity-inspired-by-binary-tomography03358nas a2200277 4500008004100000245010600041210006900147260002400216300001400240490000700254520240400261100002202665700001902687700001902706700001802725700001902743700001902762700002202781700002002803700002502823700002302848700002002871700002002891700002102911856014802932 2015 eng d00aPeriosteal microcirculatory reactions in a zoledronate-induced osteonecrosis model of the jaw in rats0 aPeriosteal microcirculatory reactions in a zoledronateinduced os bSpringercJuly 2015 a1279-12880 v193 aNitrogen-containing bisphosphonates induce osteonecrosis mostly in the jaw and less frequently in other bones. Because of the crucial role of periosteal perfusion in bone repair, we investigated zoledronate-induced microcirculatory reactions in the mandibular periosteum in comparison with those in the tibia in a clinically relevant model of bisphosphonate-induced medication-related osteonecrosis of the jaw (MRONJ).

Sprague–Dawley rats were treated with zoledronate (ZOL; 80 i.v. μg/kg/week over 8 weeks) or saline vehicle. The first two right mandibular molar teeth were extracted after 3 weeks. Various systemic and local (periosteal) microcirculatory inflammatory parameters were examined by intravital videomicroscopy after 9 weeks.

Gingival healing disorders (∼100 %) and MRONJ developed in 70 % of ZOL-treated cases but not after saline (shown by micro-CT). ZOL induced significantly higher degrees of periosteal leukocyte rolling and adhesion in the mandibular postcapillary venules (at both extraction and intact sites) than at the tibia. Leukocyte NADPH-oxidase activity was reduced; leukocyte CD11b and plasma TNF-alpha levels were unchanged.

Chronic ZOL treatment causes a distinct microcirculatory inflammatory reaction in the mandibular periosteum but not in the tibia. The local reaction in the absence of augmented systemic leukocyte inflammatory activity suggests that topically different, endothelium-specific changes may play a critical role in the pathogenesis of MRONJ.

This model permits for the first time to explore the microvascular processes in the mandibular periosteum after chronic ZOL treatment. This approach may contribute to a better understanding of the pathomechanism and the development of strategies to counteract bisphosphonate-induced side effects.

1 aJanovszky, Ágnes1 aSzabó, Andrea1 aVarga, Renáta1 aGarab, Dénes1 aBoros, Mihály1 aMester, Csilla1 aBeretka, Nikolett1 aZombori, Tamás1 aWiesmann, Hans-Peter1 aBernhardt, Ricardo1 aOcsovszki, Imre1 aBalázs, Péter1 aPiffkó, József uhttps://build.sprocket.sed.hu/publication/periosteal-microcirculatory-reactions-in-a-zoledronate-induced-osteonecrosis-model-of-the-jaw-in-rats00462nas a2200121 4500008004100000245005600041210005600097260004200153300000700195100002000202700002000222856009800242 2014 eng d00aEliminating switching components in binary matrices0 aEliminating switching components in binary matrices aSzeged, HungarybUniversity of Szeged a211 aHantos, Norbert1 aBalázs, Péter uhttps://build.sprocket.sed.hu/publication/eliminating-switching-components-in-binary-matrices01145nas a2200181 4500008004100000020002200041022001400063245008900077210006900166260004400235300001000279520046200289100002000751700002000771700002500791700001600816856013100832 2014 eng d a978-3-319-12567-1 a0302-974300aFast Heuristics for Eliminating Switching Components in Binary Matrices by 0-1 Flips0 aFast Heuristics for Eliminating Switching Components in Binary M aPuerto Vallarta, MexicobSpringerc2014 a62-693 a

Switching components are special patterns in binary matrices that play an essential role in many image processing and pattern analysis tasks. Finding the minimal number of 0s that must be switched to 1s in order to eliminate all switching components is an NP-complete problem. We present two novel-type heuristics for the above problems and show via experiments that they outperform the formerly proposed ones, both in optimality and in running time.

1 aHantos, Norbert1 aBalázs, Péter1 aBayro-Corrochano, E.1 aHancock, E. uhttps://build.sprocket.sed.hu/publication/fast-heuristics-for-eliminating-switching-components-in-binary-matrices-by-0-1-flips00835nas a2200253 4500008004100000022002200041245005600063210005500119260005200174300001200226100002000238700001800258700001700276700001600293700002000309700002800329700002300357700001900380700002700399700001900426700001800445700002400463856009400487 2014 hun d a978-963-473-712-400aKépfeldolgozás a szegedi informatikus-képzésben0 aKépfeldolgozás a szegedi informatikusképzésben aDebrecen, HungarybUniversity of Debrecenc2014 a667-6751 aBalázs, Péter1 aKatona, Endre1 aKato, Zoltan1 aNagy, Antal1 aNémeth, Gábor1 aNyúl, László, Gábor1 aPalágyi, Kálmán1 aTanacs, Attila1 aVarga, László Gábor1 aKunkli, Roland1 aPapp, Ildikó1 aRutkovszky, Edéné uhttps://build.sprocket.sed.hu/publication/kepfeldolgozas-a-szegedi-informatikus-kepzesben00600nas a2200121 4500008004100000245011800041210006900159260004200228300000700270100002100277700002000298856016000318 2014 eng d00aReconstruction of hv-convex binary matrices from horizontal and vertical projections based on simulated annealing0 aReconstruction of hvconvex binary matrices from horizontal and v aSzeged, HungarybUniversity of Szeged a501 aOzsvár, Zoltán1 aBalázs, Péter uhttps://build.sprocket.sed.hu/publication/reconstruction-of-hv-convex-binary-matrices-from-horizontal-and-vertical-projections-based-on-simulated-annealing