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Статті в журналах з теми "Algorithmes de reconstruction tomographique"
Rigaud, Gaël, and Maï K. Nguyen. "Algorithmes de reconstruction d’images pour deux modalités de tomographie Compton par transmission." Instrumentation Mesure Métrologie 12, no. 1-2 (June 30, 2012): 199–223. http://dx.doi.org/10.3166/i2m.12.1-2.199-233.
Повний текст джерелаMariano-Goulart, D. "Reconstruction tomographique en imagerie médicale." EMC - Radiologie et imagerie médicale - Principes et techniques - Radioprotection 4, no. 1 (January 2009): 1–17. http://dx.doi.org/10.1016/s1879-8497(09)72874-2.
Повний текст джерелаSarfati, B., F. Rimareix, J. F. Honart, H. Alkhashnam, K. T. De Frémicourt, A. Conversano, S. Struk, et al. "Algorithmes décisionnels en reconstruction mammaire immédiate." Annales de Chirurgie Plastique Esthétique 63, no. 5-6 (November 2018): 585–88. http://dx.doi.org/10.1016/j.anplas.2018.07.002.
Повний текст джерелаGaullier, Gil, Pierre Charbonnier, Fabrice Heitz, and Philippe Côte. "Modèles déformables contraints en reconstruction tomographique par temps de première arrivée." Traitement du signal 32, no. 2-3 (October 28, 2015): 215–43. http://dx.doi.org/10.3166/ts.32.215-243.
Повний текст джерелаBizais, Yves, Frédéric Lamare, Alexandre Turzo, and Dimitris Visvikis. "L’imagerie médicale: du 2D au 3D, les problèmes particuliers posés par la reconstruction tomographique en tomographie par émission de positons." Annales Des Télécommunications 58, no. 5-6 (May 2003): 801–19. http://dx.doi.org/10.1007/bf03001531.
Повний текст джерела-BRUANDET, Jean-Pierre. "Modélisation physique du bruit dans les images d'atténuation : influence dans un contexte de reconstruction tomographique 3D à partir d'un faible nombre de projections." Revue de l'Electricité et de l'Electronique -, no. 02 (2001): 49. http://dx.doi.org/10.3845/ree.2001.020.
Повний текст джерелаPoreba, Martyna, and François Goulette. "Recalage rigide de relevé laser par mise en correspondance robuste basée sur des segments." Revue Française de Photogrammétrie et de Télédétection, no. 207 (September 24, 2014): 3–17. http://dx.doi.org/10.52638/rfpt.2014.208.
Повний текст джерелаДисертації з теми "Algorithmes de reconstruction tomographique"
Recur, Benoît. "Précision et qualité en reconstruction tomographique : algorithmes et applications." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14113/document.
Повний текст джерелаA large kind of methods are available now to acquire an object in a non-destructive way (X-Ray scanner, micro-scanner, Tera-hertz waves, Transmission Electron Microscopy, etc). These tools acquire a projection set around the object and a reconstruction step leads to a representation of the acquired domain. The main limitation of these methods is that they rely on a continuous domain modeling wheareas they compute in a finite domain. The resulting discretization step sparks off errors in obtained images. Moreover, the acquisition step is not performed ideally and may be corrupted by artifacts and noises. Many direct or iterative methods have been developped to try to reduce errors and to give a better representative image of reality. An overview of these reconstructions is proposed and it is enriched with a study on quality, precision and noise robustness.\\Since the discretization is one of the major limitations, we try to adjust discrete methods for the reconstruction of real data. These methods are accurate in a finite domain but are not suitable for real acquisition, especially because of their error sensitivity. Therefore, we propose a link between the two worlds and we develop new discrete and noise robust methods. Finally, we are interesting in the missing data problem, i.e. when the acquisition is not uniform around the object, giving deformations into reconstructed images. Since discrete reconstructions are insensitive to this effect, we propose a primer solution using the tools developed previously
Abdmouleh, Fatma. "Reconstitution tomographique de propriétés qualitatives et quantitatives d'images." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01011954.
Повний текст джерелаMillardet, Maël. "Amélioration de la quantification des images TEP à l'yttrium 90." Thesis, Ecole centrale de Nantes, 2022. https://tel.archives-ouvertes.fr/tel-03871632.
Повний текст джерелаYttrium-90 PET imaging is becoming increasingly popular. However, the probability that decay of a yttrium-90 nucleus will lead to the emission of a positron is only 3.2 × 10-5, and the reconstructed images are therefore characterised by a high level of noise, as well as a positive bias in low activity regions. To correct these problems, classical methods use penalised algorithms or allow negative values in the image. However, a study comparing and combining these different methods in the specific context of yttrium-90 was still missing at the beginning of this thesis. This thesis, therefore, aims to fill this gap. Unfortunately, the methods allowing negative values cannot be used directly in a dosimetric study. Therefore, this thesis starts by proposing a new method of post-processing the images, aiming to remove the negative values while keeping the average values as locally as possible. A complete multi-objective analysis of these different methods is then proposed. This thesis ends by laying the foundations of what could become an algorithm providing a set of adequate reconstruction hyper parameters from sinograms alone
Vallot, Delphine. "Reconstruction adaptative optimisée pour la quantification en tomographie de positons couplée à un tomodensitomètre." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30188.
Повний текст джерелаThis study was initiated to evaluate an iterative reconstruction algorithm in positron emission tomography based on a regularization method to obtain convergence. Our aim was to assess its performance, in comparison with other currently available algorithms and to study the impact of the only parameter available to users for eventual optimization, both using anthropomorphic phantoms and clinical data. We confirm that this algorithm shows several advantages compared to the traditional OSEM-MLEM concerning noise, contrast and detectability. By using anthropomorphic phantoms and with access to more reconstruction parameters, the performance could be further improved to decrease the artefacts and the overestimation of certain metrics. Work in progress
Laurent, Christophe. "Adéquation algorithmes et architectures parallèles pour la reconstruction 3D en tomographie X." Phd thesis, Université Claude Bernard - Lyon I, 1996. http://tel.archives-ouvertes.fr/tel-00004999.
Повний текст джерелаFranchois, Ann. "Contribution a la tomographie microonde : algorithmes de reconstruction quantitative et verifications experimentales." Paris 11, 1993. http://www.theses.fr/1993PA112234.
Повний текст джерелаDefontaine-Caritu, Marielle. "Reconstruction optique de tomographies : application à la tomographie ultrasonore en réflexion." Compiègne, 1995. http://www.theses.fr/1995COMPD814.
Повний текст джерелаIsrael-Jost, Vincent. "Optimisation de la reconstruction en tomographie d'émission monophotonique avec colimateur sténopé." Université Louis Pasteur (Strasbourg) (1971-2008), 2006. https://publication-theses.unistra.fr/public/theses_doctorat/2006/ISRAEL-JOST_Vincent_2006.pdf.
Повний текст джерелаIn SPECT small animal imaging, it is highly recommended to accurately model the response of the detector in order to improve the low spatial resolution. The volume to reconstruct is thus obtained both by backprojecting and deconvolving the projections. We chose iterative methods, which permit one to solve the inverse problem independently from the model's complexity. We describe in this work a gaussian model of point spread function (PSF) whose position, width and maximum are computed according to physical and geometrical parameters. Then we use the rotation symmetry to replace the computation of P projection operators, each one corresponding to one position of the detector around the object, by the computation of only one of them. This is achieved by choosing an appropriate polar discretization, for which we control the angular density of voxels to avoid oversampling the center of the field of view. Finally, we propose a new family of algorithms, the so-called frequency adapted algorithms, which enable to optimize the reconstruction of a given band in the frequency domain on both the speed of convergence and the quality of the image
Israel-Jost, Vincent Sonnendrücker Eric Constantinesco André. "Optimisation de la reconstruction en tomographie d'émission monophotonique avec colimateur sténopé." Strasbourg : Université Louis Pasteur, 2007. http://eprints-scd-ulp.u-strasbg.fr:8080/698/01/israel-jost2006.pdf.
Повний текст джерелаCharbonnier, Pierre. "Reconstruction d'image : régularisation avec prise en compte des discontinuités." Nice, 1994. http://www.theses.fr/1994NICE4763.
Повний текст джерелаThis thesis deals with regularized image reconstruction. We seek images consisting of smooth regions separated by sharp edges, or discontinuities. This is called edge-preserving regularization. The reconstructed image is found by minimizing an objective function, which we call criterion. Firstly, we propose sufficient conditions for the design of an edge-preserving objective function. Then, we show that, under these conditions, it is possible to transform the criterion by introducing an auxiliary vairable, which interacts with the main variable either in an additive or in a multiplicative way. The role of the auxiliary variable is twofold: it marks discontinuities and facilitates the optimization of the criterion. The augmented objective function is quadratic with respect to the main variable when the auxiliary variable is fixed, and convex with respect to the auxiliary variable when the main variable is fixed. Moreover, in the last case, we give the expression of the optimal value of the auxiliary variable. Secondly, we exploit the properties of such a half-quadratic regularization to design new reconstruction algorithms. Our optimization strategy is based on alternated minimizations with respect to the auxiliary and the main variable. This leads to two progessive discontinuity introduction algorithms: ARTU and LEGEND. We propose a theoretical and practical study of these algorithms. We apply them to tomographic reconstruction. ARTUR and LEGEND offer a good trade-off between compuation time and image quality. However, huge linear systems have to be solved. We propose, as a perspective, a means of reducing the volume of information involved for reconstruction. Thereby, greater image dimensions can be envisionned
Частини книг з теми "Algorithmes de reconstruction tomographique"
Mariano-Goulart, D. "Reconstruction tomographique en imagerie médicale." In Traitement De L'image, 53–97. Elsevier, 2013. http://dx.doi.org/10.1016/b978-2-294-73685-8.00002-8.
Повний текст джерелаRODRIGUE, Nicolas. "Le paradigme bayésien en phylogénie moléculaire." In Modèles et méthodes pour l’évolution biologique, 203–21. ISTE Group, 2022. http://dx.doi.org/10.51926/iste.9069.ch8.
Повний текст джерела