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Artykuły w czasopismach na temat "Imagerie médicale – Tomodensitométrie"
ACKO Ubrich, ACKO-OHUI Estelle, KOUASSI Lauret, BAMBA Aïchata i KPATA Mauriane. "Iatrogénie au produit de contraste iodé chez un septuagénaire : une responsabilité partagée." Journal Africain d Imagerie Médicale (J Afr Imag Méd) Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF) 16, nr 1 (10.05.2024): 46–50. http://dx.doi.org/10.55715/jaim.v16i1.536.
Pełny tekst źródłaLAFOURCADE, P., P. RUMEAU, S. DE RÉGLOIX i P. H. SAVOIE. "Pathologies traumatiques de l’articulation tibio-fibulaire proximale : revue de la littérature à propos d’un cas". Médecine et Armées Vol. 42 No. 2, Volume 42, Numéro 2 (1.04.2014): 171–76. http://dx.doi.org/10.17184/eac.6990.
Pełny tekst źródłaSimeon, Ludovic. "Dépistage et diagnostic de la surdité chez le chien". Bulletin de l'Académie Vétérinaire de France 176 (2023). http://dx.doi.org/10.3406/bavf.2023.71047.
Pełny tekst źródłaAdministrateur- JAIM, KONE Abdoulaye, DIAWARA Youssouf, KONATE Moussa, SIDIBE Fatoumata Matokoma, SAMAKE Assetou, TRAORE Seydou, TRAORE Hawa i SIDIBE Siaka. "Apport de la tomodensitométrie dans le bilan d’extension des cancers du col de l’utérus." Journal Africain d'Imagerie Médicale (J Afr Imag Méd). Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF). 14, nr 4 (1.05.2023). http://dx.doi.org/10.55715/jaim.v14i4.451.
Pełny tekst źródłaAdmin - JAIM. "Résumés des conférences JRANF 2021". Journal Africain d'Imagerie Médicale (J Afr Imag Méd). Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF). 13, nr 3 (17.11.2021). http://dx.doi.org/10.55715/jaim.v13i3.240.
Pełny tekst źródłaAdmin, Admin, DEME Hamidou, EL HASSANI Hamza, BALDE Djibril, ABOUABDILLAH Soukaina, BADJI Nfally, AKPO Léra Géraud, DIOP Abdoulaye Dione, DIOP Abdoulaye Ndoye i NIANG El Hadji. "Aspects tomodensitométriques du syndrome d’Eagle au centre hospitalier régional Heinrich Lübke de Diourbel : à propos de 30 cas". Journal Africain d'Imagerie Médicale (J Afr Imag Méd). Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF). 12, nr 4 (17.06.2021). http://dx.doi.org/10.55715/jaim.v12i4.164.
Pełny tekst źródłaAdministrateur- JAIM, YEKPE AHOUANSOU Patricia, ADJADOHOUN Sonia, GNANGNON Freddy, SEWANOU Moïse, DONGMO Yannick, BIAOU Olivier i BOCO Vicentia. "Accessibilité à l’imagerie dans la prise en charge des cancers du sein en milieu hospitalier au Benin". Journal Africain d'Imagerie Médicale (J Afr Imag Méd). Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF). 14, nr 1 (10.07.2022). http://dx.doi.org/10.55715/jaim.v14i1.332.
Pełny tekst źródłaRozprawy doktorskie na temat "Imagerie médicale – Tomodensitométrie"
Guerra, Rui. "Intégration des mouvements physiologiques en tomodensitométrie : estimation, reproduction et influence en imagerie cardiaque". Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL003N/document.
Pełny tekst źródłaThe new idea presented in this work takes into account patient motion in the acquisition and reconstruction processes. For this work, the complete acquisition system has been developed in order to reproduce physiologic motion, analyse their effect and propose correction methods to reduce image artefacts. A new methodology based on Doppler Tissue Imaging was used to find the motion in three dimensions of several coronary artery segments. Based on these data, optimal temporal windows were defined for reconstruction and an analysis of the ideal temporal window in the heart cycle was proposed. Both motion models were then used the control of a motion platform and as input for computer simulations. A first analysis carried on coronary calcification showed the influence of respiratory motion. Estimation and correction of motions were then performed on CT raw data and simulated motion. This works shows that it is necessary to include motion in the acquisition/reconstruction algorithms in CT
Gondim, Teixeira Pedro Augusto. "Développement et amélioration des outils d'imagerie médicale pour la caractérisation des masses tumorales du système ostéo-articulaire". Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0178/document.
Pełny tekst źródłaMedical imaging plays a major role in the identification, characterization and staging of tumor lesions of the musculoskeletal system. The vast majority of these neoplasms are benign and it is important to recognize and distinguish them from malignant lesions. Malignant lesions carry a worse prognosis and are usually treated aggressively. MRI is currently the method of choice for evaluating musculoskeletal tumors. Despite a high sensitivity for the detection of bone and soft tissue tumors, a large number of identified lesions remain indeterminate in origin after imaging work-up. In recent years, new functional imaging techniques, which allow tumor evaluation in a biochemical and cellular level, have emerged. These techniques such as perfusion, diffusion weighted imaging and MR spectroscopy, originally designed for the evaluation of brain tumors, began to be used for the evaluation of musculoskeletal neoplasms with promising preliminary results. Meanwhile, with the development of wide area-detector CT systems and contrast enhanced ultrasound (CEUS) new ways of assessing tumor perfusion became available in clinical practice. Functional imaging nevertheless remains largely inaccessible outside research oriented imaging centers. The clinical application of these new methods is hindered by various factors, which include the great histological heterogeneity of musculoskeletal tumors and patient related technical difficulties. In this project, the diagnostic performance of several functional imaging methods in clinical practice was assessed. Additionally tools for image quality improvement and artifact reduction were tested. Finally, the diagnostic performance of different perfusion methods (ultrasound, computed tomography and magnetic resonance imaging) was compared
Bérard, Philippe. "Réalisation d'un nouveau prototype combiné TEP/TDM pour l'imagerie moléculaire de petits animaux". Thèse, Université de Sherbrooke, 2010. http://savoirs.usherbrooke.ca/handle/11143/4289.
Pełny tekst źródłaZuluaga, Valencia Maria Alejandra. "Méthodes d'automatisation de la détection des lésions vasculaires dans des images de tomodensitométrie". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00860825.
Pełny tekst źródłaCedilnik, Nicolas. "Personnalisation basée sur l'imagerie de modèles cardiaques électrophysiologiques pour la planification du traitement de la tachycardie ventriculaire". Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4097.
Pełny tekst źródłaAcute infarct survival rates have drastically improved over the last decades, mechanically increasing chronic infarct related affections.Among these affections, ischaemic ventricular tachycardia (VT) is a particularly serious arrhythmia that can lead to the often lethal ventricular fibrillation. VT can be treated by radio frequency ablation of the arrhythmogenic substrate.The first phase of this long and risky interventional cardiology procedure is an electrophysiological (EP) exploration of the heart.This phase aims at localising the ablation targets, notably by inducing the arrhythmia in a controlled setting. In this work we propose to re-create this exploration phase in silico, by personalising cardiac EP models.We show that key information about infarct scar location and heterogeneity can be automatically obtained by a deep learning-based automated segmentation of the myocardium on computed tomography (CT) images.Our goal is to use this information to run patient-specific simulations of depolarisation wave propagation in the myocardium, mimicking the interventional cardiology exploration phase.We start by studying the relationship between the depolarisation wave propagation velocity and the left ventricular wall thickness to personalise an Eikonal model, an approach that can successfully reproduce periodic activation maps of the left ventricle recorded during VT.We then propose efficient algorithms to detect the repolarisation wave on unipolar electrograms (UEG), that we use to analyse the UEGs embedded in such intra-cardiac recordings.Thanks to a multimodal registration between these recordings and CT images, we establish relationships between action potential durations/restitution properties and left ventricular wall thickness.These relationships are finally used to parametrise a reaction-diffusion model able to reproduce interventional cardiologists' induction protocols that trigger realistic and documented VTs. inteinterventional cardiologists' induction protocols that trigger realistic and documented VTs
Santelli, Julien. "Nanoparticules multimodales à base de lanthanides pour l'imagerie biomédicale et le suivi de cellules mésenchymateuses". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30042/document.
Pełny tekst źródłaThe objective of these works was to put into practice the use of lanthanide-based multimodal nanoparticles (NPs) for biomedical imaging in general and mesenchymal cells (MSCs) tracking in particular. To that purpose, two types of NPs have been used, both presenting a gadolinium oxysulfide (Gd2O2S) matrix allowing magnetic resonance imaging (MRI) and computed tomography. The addition of dopant elements brings fluorescence properties: europium (Gd2O2S :Eu3+) is more appropriate for an in vitro examination whereas the combination ytterbium/thulium (Gd2O2S :Yb3+/Tm3+) is more appropriate for an in vivo examination through the up-conversion process. First, we have demonstrated the possibility of visualizing those NPs over-time in a living organism with complementary methods (MRI and fluorescence). The complete study of their biodistribution and ways of elimination allowed us to highlight a hepatobiliary metabolization associated with a slow feces excretion. The labeling of a wide variety of cell types (lines and primary cells from different species) has also pointed out their potential as a universal cell tracer. Thereafter, we focused our research on mesenchymal cells tracking in a cell therapy context. Short, medium and long term biocompatibility was validated via a series of analyses (MTT, neutral red, wound healing and differentiation) and the reliability of the tracer was confirmed by detailed study of the cell labeling. Finally, after developing a custom-made system dedicated to up-conversion imaging in small animals, we were able to perform over-time tracking of those labeled cells after injection in a solid organ. We achieved multimodal imaging of the MSCs with MRI, computed tomography and up-conversion. Altogether, these results underline the potential of these nanoparticles for long term imaging in preclinical and/or clinical studies
Torfeh, Tarraf. "Automatisation du contrôle de qualité d'une installation d'imagerie de repositionnement en radiothérapie externe". Phd thesis, Université de Nantes, 2009. http://tel.archives-ouvertes.fr/tel-00426889.
Pełny tekst źródłaBouilhol, Gauthier. "Incertitudes et mouvement dans le traitement des tumeurs pulmonaires : De la radiothérapie à l’hadronthérapie". Thesis, Lyon, INSA, 2013. http://www.theses.fr/2013ISAL0131/document.
Pełny tekst źródłaThis PhD thesis focuses on the uncertainties and motion management in lung radiation therapy and particle therapy. Passive motion management techniques are considered. They consist in delivering the dose without any respiratory beam monitoring which may be difficult to set up or may introduce additional uncertainties. Clinical and methodological contributions about different treatment steps are proposed. First of all, computed tomography (CT) images for treatment planning must be carefully acquired in the presence of respiration-induced tumor motion. We assessed the impact of motion artifacts on the quality of treatment planning. We also proposed methodologies and recommendations about the optimization of 4D-CT acquisition parameters and an original method for automated motion artifact detection in 4D-CT images. Target delineation introduces one of the main source of uncertainties during radiation therapy treatment planning. We quantified inter-observer variations in the delineation of the gross tumor volume (GTV) and the internal target volume (ITV) using an original method in order to incorporate them in margin calculation. Reduction of motion uncertainties can be achieved by combining an abdominal pressure device with the immobilization system to reduce the amplitude of respiratory motion. We proposed a study to evaluate the usefulness of such a device according to the tumor location within the lung. Delivering the dose to the ITV implies an important exposure of healthy tissues along the tumor trajectory. An alternative strategy consists in irradiating the tumor in its time-averaged mean position, the mid-position. Margins are reduced compared with an ITV-based strategy while maintaining a correct tumor coverage. One part of the work consisted in participating in the implementation of a clinical trial in photon radiation therapy to compare the two strategies, ITV and mid-position. In the margin recipe proposed by van Herk, a Gaussian distribution of all combined errors is assumed. In most cases, respiratory motion has an asymmetric non-Gaussian distribution and the assumption may not be valid for strongly asymmetric tumor motions with a large amplitude. We proposed a numerical population-based model to incorporate asymmetry and non-Gaussianity of respiratory motion in margin calculation. Finally, when taking respiratory motion into account in particle therapy with safety margins, one must consider various parameters, particularly the dose deposit sensitivity to density variations. The last part is dedicated to a discussion on the defining of safety margins in order to optimally take into account respiratory motion
Viti, Mario. "Automated prediction of major adverse cardiovascular events". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPASG084.
Pełny tekst źródłaThis research project is expected to be financed by a CIFRE scholarship in collaboration between GE Healthcare and CentraleSupelec. We are seeking to predict Major Adverse Cardiovascular Events (MACE). These are typically embolism and aneurisms in the aorta and the coronary arteries, that give rise respectively to interrupted blood flow to the heart and so a risk of infarctus, or major hemorrhage. Both are life-threatening. When a patient is brought to hospital for an alert (angina, etc), they will undergo an X-ray CAT scan, which can be more or less invasive. A major objective of this research is to utilize as well as possible the available information in the form of 3D images together with patient history and other data, in order to avoid needless, invasive, irradiating or dangerous exams, while simultaneously guaranteeing optimal care and the best possible clinical outcome. The proposed methodologies include image analysis, image processing, computer vision and medical imaging procedures and methods, that will be developed in partnership between GE Healthcare and the CVN lab of CENTRALE SUPELEC
Vilches, Freixas Gloria. "Dual-energy cone-beam CT for proton therapy". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI099/document.
Pełny tekst źródłaProton therapy is a promising radiation treatment modality that uses proton beams to treat cancer. Current treatment planning systems rely on an X-ray computed tomography (CT) image of the patient's anatomy to design the treatment plan. The proton stopping-power ratio relative to water (SPR) is derived from CT numbers (HU) to compute the absorbed dose in the patient. Protons are more vulnerable than photons to changes in tissue SPR in the beam direction caused by movement, misalignment or anatomical changes. In addition, inaccuracies arising from the planning CT and intrinsic to the HU-SPR conversion greatly contribute to the proton range uncertainty. In clinical practice, safety margins are added to the treatment volume to account for these uncertainties at the expense of losing organ-sparing capabilities. The use of dual-energy (DE) in proton therapy was first suggested in 2009 to better estimate the SPR with respect to single-energy X-ray imaging. The aim of this thesis work is to investigate the potential improvement in determining proton SPR using DE to reduce the uncertainty in predicting the proton range in the patient. This PhD work is applied to a new imaging device, the Imaging Ring (IR), which is a cone-beam CT (CBCT) scanner developed for image-guided radiotherapy (IGRT). The IR is equipped with a fast kV switching X-ray source, synchronized with a filter wheel, allowing for multi-energy CBCT imaging. The first contribution of this thesis is a method to calibrate a model for the X-ray source and the detector response to be used in X-ray image simulations. It has been validated experimentally on three CBCT scanners. Secondly, the investigations have evaluated the factors that have an impact on the outcome of the DE decomposition process, from the acquisition parameters to the post-processing. Both image- and projection-based decomposition domains have been thoroughly investigated, with special emphasis on projection-based approaches. Two novel DE decomposition bases have been proposed to estimate proton SPRs, without the need for an intermediate variable such as the effective atomic number. The last part of the thesis proposes an estimation of proton SPR maps of tissue characterization and anthropomorphic phantoms through DE-CBCT acquisitions with the IR. A correction for X-ray scattering has been implemented off-line, and a routine to linearly interpolate low-energy and high-energy sinograms from sequential and fast-switching DE acquisitions has been proposed to perform DE material decomposition in the projection domain with real data. DECT-derived SPR values have been compared with experimentally-determined SPR values in a carbon-ion beam
Części książek na temat "Imagerie médicale – Tomodensitométrie"
Coqueugniot, Hélène. "Paléo-imagerie par rayons X : une méthode d’exploration transdisciplinaire, de l’archéologie à la chirurgie Hélène". W Regards croisés: quand les sciences archéologiques rencontrent l'innovation, 139–56. Editions des archives contemporaines, 2017. http://dx.doi.org/10.17184/eac.3794.
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