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Artykuły w czasopismach na temat "Imagerie médicale – Rayonnements électromagnétiques"
Foucart, Jean-Michel, Rufino Felizardo i Christophe Pizelle. "La radioprotection en orthodontie : données utiles". L'Orthodontie Française 83, nr 1 (marzec 2012): 3–10. http://dx.doi.org/10.1051/orthodfr/2011147.
Pełny tekst źródłaKouandongui Bangue Songrou, F., E. Bidan Tapiade, M. Ouimon i T. Mobima. "Connaissances en matière de radioprotection des manipulateurs de radiologie de Bangui et de Bimbo (Centrafrique)". Radioprotection 54, nr 1 (styczeń 2019): 41–45. http://dx.doi.org/10.1051/radiopro/2018046.
Pełny tekst źródłaAdmin, Admin, SAVI de TOVE Kofi-Mensa, FACHINAN Herbert, GOUNONGBE Fabien, AKANNI Djivèdé, ADJOVI Boris Gil-Christ, KIKI Miralda, YEKPE AHOUANSOU Patricia, BIAOU Olivier i BOCO Vicentia. "Radioprotection en imagerie médicale dans les hôpitaux du nord Bénin." Journal Africain d'Imagerie Médicale (J Afr Imag Méd). Journal Officiel de la Société de Radiologie d’Afrique Noire Francophone (SRANF). 12, nr 3 (27.12.2020). http://dx.doi.org/10.55715/jaim.v12i3.112.
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 źródłaRozprawy doktorskie na temat "Imagerie médicale – Rayonnements électromagnétiques"
El, Kanfoud Ibtissam. "Résolution de problèmes de rayonnement électromagnétique appliqués à l’imagerie médicale avec FreeFEM++". Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4000/document.
Pełny tekst źródłaThe use of microwaves for diagnosis is booming in the medical field. One of the latest applications is the detection of strokes by microwave imaging. The company EMTensor GmbH based in Vienna, Austria is currently studying such a system in collaboration with LEAT, the LJAD of the Côte d’Azur University and the LJLL of Sarbonne University, for the diagnosis and control of the treatement efficiency. The purpose of this work is to model the brain imaging measurement system developed by EMTensor GmbH. It is a transmission/ reception system consisting of 160 antennas arranged in 5 rings of 32 antennas distributed on a cylinder metal tank of semi-open circular section. One of the major issues of this work is the modeling and electromagnetic simulation (EM) of the complete system including a realistic brain model. The difficulty lies both in the size of the EM problem to be simulated beacause of the relationship between the considerable size of the system and the the very small size of certain inhomogeneities within the brain, and the great heterogeneity of the dielectric permittivities present inside the brain. We decided to use an open source software, FreeFem++ for this modelling because it is well adapted to high performance computing through domain decomposition methods, which is mandatory for the complexity of the EM problem. First, we compared the simulation results of the vacuum matching measurement system (without the brain) to the measurements and the results obtained by the FEM-based EM HFSS simulation software to those obtained by FreeFem++. We then simulated a virtual threedimensional head model, from brain imaging system cuts (CT scan and MRI), in partnership with EMTensor, looking for the position and type of stroke (ischemic and hemorragic). The influence of the measurement noise, the value of the adaptation gel used, the coupling between the sensors and the coupling between the head and the sensors are also studied. In order to validate these models, two simple cases have been studied. A large tube and a small plastic tube are fielld with adaptation liquid with the dielectric characteristic of a brain to find the shape of the tubes used by qualitative imaging. Finally, with the MEDIMAX project partners and the EMTensor company we applied a quantitative method to the detection of ischemic stroke by the microwave tomography. The direct problem has been solved with the help of FreeFem++, using hight order elements and parallel preconditioners for the domain decomposition method. We solved the inverse problem by a minimization algorithm, in order to reconstruct tomographic images of the brain in times compatible with medical imperatives defined by clinicians.”
Begani, Provinciali Ginevra. "X-ray phase imaging based on Hartmann Wavefront Sensor for applications on the study of neurodegenerative diseases". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. https://theses.hal.science/tel-03670415.
Pełny tekst źródłaThe aim of this PhD thesis is to develop the technic of X-ray phase imaging with Hartmann wavefront sensor for various applications and to compare this new system against well-established phase-contrast techniques. The X-ray phase imaging will be mainly performed in 3D using tomographic setup. The main application includes the study of alteractions in the central nervous system induced by neurodegenerative diseases. The first introductory section describes the basic aspects of X-ray interaction with matter and of yhe coherence theory with specific application to the Hartmann wavefront sensor design. In the second chapter, an introduction to the free-space propagation technique. The third chapter examines the principles of tomography acquisitions and the available reconstruction algorithms. A separate chapter, labeled 4, is dedicated to the theory of Hartmann wavefront sensor. A 3D wave propagation model based on Fresnel propagator was developed to optimize the architecture of the full wavefront sensor including the Hartmann plate, the distances between the different elements of the set-up as well as the X-ray source. The model can manage any degree of spatial coherence, enabling the accurate simulation of a wide range of X-ray sources. Several simulations of standard experimental situations are described to valid the program. Then, the main wavefront reconstruction algorithms have been analyzed. In chapter 5, we will present experimental results obtained with the X-ray Hartmann wavefront sensor using both a parallel beam geometry (synchrotron measurements) and a cone beam geometry (laboratory measurements). Different Hartmann plates were used with the laboratory set-up to visualize a series of test and biological samples. also, using synchrotron, we tested the Hartmann sensor to retrieve the chemical composition of objects composed of known materials. The chemical composition could be inferred starting from direct and independent measurements of the real part (proportional to the phase) and the imaginary part (proportional to the absorption) of the sample refractive index. In chapter 6, the experimental results obtained with free space propagation X-ray phase contrast tomography will be discussed. We exploited the capability of X-ray phase contrast imaging to investigate the effects of neurodegenerative diseases on the central nervous system
Emond, Patrick. "Développement de médicaments radiopharmaceutiques émetteurs de rayonnements gamma pour l'exploration du transporteur de la dopamine dans le système nerveux central". Tours, 1997. http://www.theses.fr/1997TOUR4016.
Pełny tekst źródłaAyoub, Mohamed. "Etude des niveaux profonds dans les CdTe et CdZnTe par des méthodes électriques pour des applications biomédicales : imagerie X et γ". Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13080.
Pełny tekst źródłaNuclear medical imagery systems based on the detection of ionising rays use semiconductors which require high performances in terms of sensitivity, efficiency, dimension and in particular electrical and physical uniformity. The aim of this thesis is to study and understand the origins and effects of the deep levels in CdTe and CdZnTe crystals, as well as the effects of thermal treatment on the electrical and physical uniformity of these materials. Chapter I presents the crystal growth techniques and the electrical properties, as well as the importance of the CdTe and CdZnTe crystals in the biomedical domain. To identify the deep levels present in the material, a numerous spectroscopic methods (PICTS, SCLC, etc. ) were used as described in the chapter II. Chapter III contains the study of the electrical uniformity of these materials in term of resistivity following the development of a contactless measurement technique for resistivity : TDCM. The study of the precipitates by IR microscopy allows the correlation between the resistivity and precipitate density and their volumetric fraction. The defect characterisation which was the object of chapter IV shows the influence of the deep levels on the electrical performance of the materials. Assignment attempts of some of the defects were carried out in comparison with those of the literature. Chapter V is devoted to the thermal treatments, a crucial stage for homogenising the electrical and physical properties of our materials. A study was performed to know the influence of the various thermal treatments on the macro and microscopic defects and consequently on the homogeneity of the electrical and physical properties of the materials. As a conclusion, an optimised annealing efficiency on the pixel detector matrices is presented in Chapter VI. In vivo tests of these matrices in biomedical applications have been carried out
Soullié, Paul. "Développement méthodologique pour l’optimisation de l’imagerie des propriétés électromagnétiques en IRM". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0152.
Pełny tekst źródłaIt is now well accepted that electromagnetic (EM) properties of biological tissues are characteristic features related to their contents or their structure. It has been an old issue to seek for ways to estimate these properties in vivo, and has thus led the scientific community to develop numerous specific tools, from raw measurement technologies to imaging methods more recently. On a fundamental level, these works make it progressively possible to reveal some specific physiological mechanisms and are contributing to improve our understanding of the living. Recently, Magnetic Resonance Imaging (MRI) has become a privileged tool in this framework, allowing among other things the reconstruction of electrical and magnetic properties in different frequency ranges, with its distinctive resolution power. Recent progress suggest it could be possible to provide a tissue-specific electromagnetic MR contrast, that we consider as promising new biomarker from a clinical perspective. In a quest to give new insights for a better understanding of in vivo electromagnetic phenomena, as well as contributing to a comprehensive approach of EM modelling, we have endeavoured to develop an innovative electromagnetic mapping method with an MR scanner. In the MR community, the study of EM properties led to the development of two main research fields: the so-called “low-frequency imaging”, under 1 MHz, and the “high-frequency imaging”, above 50 MHz, depending on the device used for stimulation. Given both these approaches, we have considered strategies that avoid additional hardware, and that could provide qualitative as well as quantitative results in the context of a classical clinical examination then. Low-frequency methods have been evaluated with simulation tools and have been progressively dismissed for practical and theoretical reasons: in that frequency range, information is polluted by the noise. Conversely, we have developed a new mapping method for electrical properties in the high frequency range, built from existing methodologies. Importantly, we wanted to provide a method that could easily be translated to clinical applications at a reasonable computational cost. To that end, we first performed simulation studies, and then MR acquisitions with specific dedicated EM phantoms. We finally used volunteers’ in vivo data to assess the performance or our algorithm in a realistic context. Our reconstruction method fits particularly well with acquisition schemes based on gradient-recalled echo with ultrashort echo-times (UTE), or more dramatically with zero echo-time (ZTE). By isolating the local EM signature in the MR signal, we use them to provide quantitative maps of electromagnetic properties, and we are able to estimate the sensitivity of these reconstructed maps to our model parameters. Our simulation results first and foremost show that our method improves the overall theoretical reconstruction quality as compared to existing related mapping techniques. Qualitative results confirm the possibility of a direct distinction, in terms of contrast, between media with variables electromagnetic properties. Quantitative results are encouraging, we observe satisfactory absolute values for reconstructed EM properties in the given frequency range. Our framework contributes to the development of EM imaging in MRI, and gives new insights for reconstruction model optimization. Efforts are still needed to achieve better use of UTE/ZTE sequences and to improve the overall quality of our reconstructions. After final numerical optimization, the reproducibility of the method will be evaluated in several test organs before its integration to a standard clinical protocol
Anouan, Koutoua Joseph. "Correction de l'effet de volume partiel en imagerie fonctionnelle par TEP au 18F-FDG pour le suivi thérapeutique de patients atteints de cancer pulmonaire non à petites cellules". Rouen, 2013. http://www.theses.fr/2013ROUES028.
Pełny tekst źródłaRobert, Jade. "Développement de modalités d'imagerie ultrasonore pour le guidage et le suivi interventionnel du traitement des arythmies cardiaques". Electronic Thesis or Diss., Lyon, 2022. http://www.theses.fr/2022LYSE1005.
Pełny tekst źródłaCardiac arrhythmias remain a major public health issue today. Some types of arrhythmias affect tens of millions of people worldwide, while others are the main cause of sudden cardiac death. In the most severe cases, it is imperative perform a treatment in order to preserve the integrity of the patient. However, interventional methods for guiding and monitoring this treatment are limited, sometimes leading to high recurrence rates, depending on the type of arrhythmia. This thesis focuses on the development of ultrafast ultrasound imaging modalities that can overcome these limitations. These modalities are Electromechanical Wave Imaging and Passive Elastography, and could provide relevant information, until now unavailable in clinic. First, ex-vivo studies on isolated working hearts were conducted to evaluate the potential of Electromechanical Wave Imaging. A blind study demonstrated that it was possible to accurately detect the type of stimulation and the source of contraction in 79% of cases. Then, two in-vivo studies, conducted on porcine model, allowed to study the feasibility of the electromechanical wave imaging on two types of probes, more adapted to an interventional context. Waves that could be associated with cardiac contraction were visualized in both studies. Nevertheless, dynamic visualization of the contraction wave was more complex in an in-vivo context, as it requires subjective interpretation of a trained reader. To address this limitation, a novel method based on time-frequency analysis of ultrasound data was developed to provide a more objective representation of the cardiac contraction, without the need of a trained reader. The method was validated, qualitatively and quantitatively, on ex-vivo data, against the reference method used for Electromechanical Wave Imaging in the literature. By applying the method to the data from the in-vivo studies, it could be demonstrated that the described contraction patterns are similar between two consecutive stimulations with same conditions, and that the contraction source is correctly positioned when the stimulation probe is located in the plane. Notably, the observed contraction area was consistent with the pacing area, when located in the imaging plane, in 81% of the cases, during the study performed with an intracardiac probe. Ex-vivo studies on cardiac samples were performed to evaluate the feasibility of detecting single lesions and thermal injury patterns by Passive Elastography. It was demonstrated on a large number of samples (41 out of n = 51, 80% on two studies) that a local stiffness increase (by a factor of 1.6 to 2.5 on average), of the injured areas, was visible by elastography. The distributions of the detected lesions were consistent, and the dimensions correctly estimated (manually, 1.1 to 2.8 mm error on average), although the lesion areas detected by passive elastography were still approximate. Finally, an in-vivo study on a porcine model demonstrated the feasibility of detecting individual or in-line thermal lesions with this method
Greffier, Joël. "Reconstruction itérative en scanographie : optimisation de la qualité image et de la dose pour une prise en charge personnalisée". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT043/document.
Pełny tekst źródłaThe increasing number of scanner and the cumulative dose delivered lead to potential risk of stochastic effects. To minimize this risk, optimization on CT usage should be rigorously employed. Optimization aims to deliver the lowest dose but maintaining image quality for an accurate diagnosis. This is a complex task, which requires setting up the compromise between the dose delivered and the resulting image quality. To achieve such goal, several CT technological evolutions have been developed. Two predominant developments are the Tube Current Modulation and the Iterative Reconstruction (IR). The former lays one patient's attenuation, the latter depend on advanced mathematical approaches. Using IR allows one to maintain equivalent image quality values by reducing the dose. However, it changes the composition and texture of the image and requires the use of appropriate metric to evaluate them. The aim of this thesis was to evaluate the impact of using IR on dose reduction and image quality in routine for all patients, protocols with the lowest dose delivered with an image quality suitable for diagnosis. The first part of the thesis addressed the compromise between dose delivered and image quality. Metrics of the image quality and the dosimetric indicators were applied as well the principle and the contribution of IRs were explored. The second part targets the description of the three steps performed in this thesis to achieve the objectives. The third part of the thesis consists of a scientific production of seven papers. The first paper presents the global optimization methodology for the establishment of low dose protocols in routine using moderate levels of IR. The second paper assesses the impact and contribution of IR to the image quality obtained to levels very low doses. The third and the fourth papers show the interest to adapt or propose protocols optimized according to patient's morphology. Finally the last three papers illustrate the development of Very Low Dose protocols for structures with high spontaneous contrast. For these protocols, doses are close to radiographic examinations with high levels of IR. The optimization process implementation has significantly doses reduction. Despite the change on the texture and on composition of the images, the quality of images obtained for all protocols was satisfactory for the diagnosis by radiologists. However, the use of routine IR requires special assessment and a learning time for radiologists
Gervaise, Alban. "Optimisation et réduction de la dose d’irradiation au scanner : aspects techniques et impact en pratique clinique courante". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0136/document.
Pełny tekst źródłaSince its introduction in the 1970s, computed tomography (CT) has become the technique of reference in medical imaging for many diseases due to its high diagnostic performance. Its main limitation is the radiation dose delivered to the patient. Considering the potential risks of radiation-induced cancer caused even with low dose exposure, dose reduction in CT is essential. In this work, we studied several technical and behavioral factors that allow for CT radiation dose reduction and optimization, without modifying the diagnostic performance. Among the behavioral factors studied, education and awareness of radiologists and radiology technicians are important elements for CT radiation dose reduction. Limiting CT scan coverage and the number of acquisition phases is also a straightforward and effective way to reduce dose exposure. Regarding technical factors, we have shown that iterative reconstruction algorithms can reduce in half the radiation dose in comparison with standard filtered back projection, while maintaining equivalent image quality. The use of wide volume mode for acquisitions with a short coverage and the use of the automatic tube current modulation can also be used to reduce and optimize CT radiation dose. Finally, we provide guidelines to optimize CT radiation dose in some clinical settings such as renal colic and musculoskeletal CT. We also propose practical guidelines for advanced clinical applications of joint dynamic CT and perfusion CT in musculoskeletal disease
Doudenkova, Victoria. "Enjeux éthiques en radiologie diagnostique : comment la bioéthique peut-elle contribuer à une meilleure radioprotection du patient?" Thèse, 2015. http://hdl.handle.net/1866/14031.
Pełny tekst źródłaWhile imaging technologies represent a real achievement for modern medicine, their introduction seems not to have been preceded by a sufficiently reflective process that would have anticipated the multiple challenges arising in current radiological practice. In focusing on the technical and scientific achievements, the actual radiation protection framework fails to consider sufficiently the essential contribution brought by social, ethical and human dimensions of disciplines such as bioethics. This failure means that today we find ourselves faced with major issues related to patient radiation protection, such as overuse of radiological examinations or medical personnel’s lack of information about the risks of radiation. Following an overview of ethical issues in diagnostic radiology affecting medical radiation protection of patients, a major issue in current practice – i.e., the inadequate justification of radiological examination prescriptions – will be analyzed using a principle-based approach. From this exercise, which aims to demonstrate how ethics can contribute concretely to radiation protection, a need arises for a new and comprehensive vision leading to solutions for controversies related to the current use of medical imaging. In a population health perspective, it is important to contribute to the reduction of the trivialization of the use of ionizing radiation in diagnostic medical practice by combining both bioethics and radiation protection. This research project aims to be a modest but necessary first step in the establishment of such an interdisciplinary dialogue.
Książki na temat "Imagerie médicale – Rayonnements électromagnétiques"
Jacques, Bories, Magot Robert i Arrivé Lionel, red. Dictionnaire de l'imagerie médicale et des rayonnements. Paris: Editions CILF, 2001.
Znajdź pełny tekst źródłaStreszczenia konferencji na temat "Imagerie médicale – Rayonnements électromagnétiques"
Ducou Le Pointe, Hubert. "Radiodiagnostic et imagerie médicale". W Rayonnements et médecine. Les Ulis, France: EDP Sciences, 2017. http://dx.doi.org/10.1051/jtsfen/2017ray02.
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