Letteratura scientifica selezionata sul tema "Imagerie à contraste élevé"
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Articoli di riviste sul tema "Imagerie à contraste élevé":
Clément, Olivier, Alain Luciani e Cédric de Bazelaire. "Produits de contraste et imagerie moléculaire". Journal de Radiologie 87, n. 10 (ottobre 2006): 1383. http://dx.doi.org/10.1016/s0221-0363(06)87323-3.
Vilov, Sergey, Thomas Chaigne, Bastien Arnal e Emmanuel Bossy. "Imagerie photoacoustique biomédicale". Photoniques, n. 94 (novembre 2018): 24–29. http://dx.doi.org/10.1051/photon/20189424.
Corréas, J. M., M. Claudon e O. Hélénon. "Apport des produits de contraste en imagerie vasculaire". Journal de Radiologie 85, n. 9 (settembre 2004): 1237. http://dx.doi.org/10.1016/s0221-0363(04)76766-9.
Clément, Olivier, Charles-André Cuenod e Olivier Hauger. "Recherche en produits de contraste et imagerie moléculaire". Journal de Radiologie 85, n. 9 (settembre 2004): 1405. http://dx.doi.org/10.1016/s0221-0363(04)77313-8.
Clément, Olivier. "Recherche en produits de contraste et imagerie moléculaire". Journal de Radiologie 88, n. 10 (ottobre 2007): 1414. http://dx.doi.org/10.1016/s0221-0363(07)81240-6.
Grenier, N. "Risques iatrogènes des produits de contraste en imagerie vasculaire". Journal des Maladies Vasculaires 35, n. 2 (marzo 2010): 82. http://dx.doi.org/10.1016/j.jmv.2010.01.020.
Bouakaz, A., G. Ferin, D. Certon e O. Basset. "Imagerie ultrasonore de contraste avec transducteurs capacitifs micro-usinés". IRBM 32, n. 2 (aprile 2011): 102–5. http://dx.doi.org/10.1016/j.irbm.2011.01.011.
Rabattu, Pierre-Yves, e Pierre-Louis Verot. "Imagerie fœtale humaine en contraste de phase au Synchrotron". Morphologie 107, n. 359 (dicembre 2023): 100657. http://dx.doi.org/10.1016/j.morpho.2023.100657.
Pastor, Catherine M., e François Terrier. "Produits de contraste hépatospécifiques en imagerie par résonance magnétique". Revue Médicale Suisse 62, n. 2490 (2004): 1476–79. http://dx.doi.org/10.53738/revmed.2004.62.2490.1476.
Alouini, Mehdi, Fabien Bretenaker, Julien Fade, Swapnesh Panigrahi e Hema Ramachandran. "Imagerie dans le brouillard à longue distance". Photoniques, n. 111 (novembre 2021): 42–46. http://dx.doi.org/10.1051/photon/202111142.
Tesi sul tema "Imagerie à contraste élevé":
Alagao, Mary Angelie. "Characterization and optimization of the Evanescent Wave Coronagraph". Electronic Thesis or Diss., Saint-Etienne, 2023. http://www.theses.fr/2023STET0060.
Direct imaging of exoplanets remains challenging due to the high contrast and the small angular separation between the star and the planet. It requires suppressing the blinding glare from the star and ensuring that the planet's faint light is not buried deep in various noises. Successful detection depends on the technological readiness and maturity of techniques and algorithms employed while considering the significant trade-offs on raw contrast, inner working angle, and throughput. One of its key components is the use of coronagraphs – instruments with the sole purpose of blocking/reducing the light from the star. This work presents a new type of Lyot coronagraph, invented by Dr. Yves Rabbia, that relies on the frustrated total internal reflection (FTIR) principle to suppress the starlight. This coronagraph is aptly called the Evanescent Wave Coronagraph (EvWaCo) owing to its nature that its focal plane mask, comprising a lens and a prism, reflects the off-axis source (planet) and transmits the on-axis source (star) by capturing the evanescent waves. This thesis aims to provide the reader with the groundwork that highlights EvWaCo's three main advantages: i) the mask is inherently achromatic, ii) the size of the mask is adjustable by changing the pressure between the lens and the prism, and iii) both the stellar light and the planet light can be collected simultaneously for low-order wavefront sensing, and proper stellar light centering. The performance of EvWaCo is assessed through experiments in a laboratory and then compared to numerical simulations. The experimental results show a raw contrast equal to a few 10-4 at 3 ��/�� over the full I-band (��c = 800 nm, ∆��/�� ≈ 20%) and at 4 ��/�� over the full R-band (��c = 650 nm, ∆��/�� ≈ 23%). The simulations confirm the achromatic rejection capability of EvWaCo as it showed a raw contrast of 10-4 at the same radial distance over both bandpasses. This thesis concludes with the status of its testbed and future perspectives
Sanalatii, Maryna. "Synthèse d'un champ acoustique avec contraste spatial élevé". Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1005/document.
The goal of this thesis is the design of a transportable speaker system, able to generate a predefined and focused sound field with a high spatial contrast. This system has eventually to allow carrying out different types of studies, for example acoustic transmission loss tests or vibration tests in non-anechoic conditions. The minimization of the number of driven channels and the number of transducers is one of the main goals of the work. The choice of the number of sources and the selection of their optimal positions in order to generate a target acoustic field has no trivial solution. To answer this question, the proposed method is based on the decomposition of the source radiation into a series of independent orthogonal functions (the "radiation modes"), constructed numerically via a singular value decomposition of the impedance matrix. By filtering the evanescent terms, the far field can be reconstructed using a small number of terms. In addition, the method allows the estimation of an efficient flow distribution to generate the target field. With the proposed method having been scarcely studied in the literature, the first part of the thesis is devoted to the problem of the experimental validation of the direct method and the study of the main parameters that are influencing the result. The problem of sources positioning in order to synthesize a predefined and focused sound field is discussed in the second part of the thesis
Jullien, Aurélie. "Génération d'impulsions laser ultra-brèves et ultra-intenses à contraste temporel élevé". Phd thesis, Ecole Polytechnique X, 2006. http://tel.archives-ouvertes.fr/tel-00077486.
Le travail présenté consiste en l'étude théorique et expérimentale d'un filtre temporel basé sur un effet non linéaire du troisième ordre, agissant sur la polarisation de l'impulsion. Nous avons étudié plusieurs déclinaisons de ce principe. Le dispositif finalement retenu repose sur la génération d'une onde polarisée orthogonalement (XPW) dans des matériaux cristallins dont la susceptibilité non linéaire d'ordre trois est anisotrope. Ce filtre non linéaire a été testé sur différents systèmes femtosecondes et permet l'amélioration du contraste sur plusieurs ordres de grandeur, comme le confirment les mesures de profils temporels sur une grande dynamique réalisées après filtrage. Nous avons également conçu un dispositif pour optimiser l'efficacité de conversion du processus non linéaire, c'est-à-dire la transmission du filtre. Cette méthode consiste à générer des interférences constructives entre les signaux XPW émis dans des cristaux distincts. Dans ces conditions, l'efficacité de transmission théorique (supérieure à 20%) est atteinte expérimentalement et dans le même temps la stabilité du système est assurée. Nous avons enfin démontré que le filtre préserve, voire améliore, les qualités spectrales et spatiales de l'impulsion.
Ces résultats sont donc particulièrement prometteurs et permettent d'envisager l'implémentation définitive du filtre dans les systèmes femtosecondes.
Jullien, Aurélie. "Génération d'impulsions laser ultra brèves et ultra intenses à contraste temporel élevé". Palaiseau, Ecole polytechnique, 2004. http://www.theses.fr/2006EPXX0013.
Novell, Anthony. "Imagerie de contraste ultrasonore avec transducteurs capacitifs micro-usinés". Phd thesis, Tours, 2011. http://tel.archives-ouvertes.fr/tel-00665141.
Bouakaz, Ayache. "Produits de contraste ultrasonore : évaluation acoustique in vitro et application". Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0058.
It's usually more difficult for a radiologist to interpret ultrasonic images than other records issued from other imaging modalities. Indeed, the ultrasonic record has no familiar landmarks for the uninitiated observer. As for other imaging techniques, the use of contrast agents could be considered. Typically, contrast ultrasound involves the injection of echo-producing microbubbles into the bloodstream to enhance the ultrasound echogenicity of a certain structure in the body. In the first part of this study, we proposed a theoretical approach for acoustic characterization of ultrasound contrast agents. Simultaneously, an experimental procedure was developed to quantify the ultrasonic properties of contrast agents in vitro. This was carried out by determining their acoustic parameters. The backscatter coefficient (BC), attenuation coefficient and scattering to attenuation ratio (STAR) were defined to quantify the ultrasonic effectiveness of the contrast agent. The experimental conditions correspond to the clinical reality. The experimental determination of ultrasonic properties is important for an appropriate use of the contrast agent. Afterwards, a method is presented and used to determine the acoustic contribution of a contrast agent to the image enhancement. Optimal values of the acoustic properties necessary to get a visible enhancement of the image are deduced. At last, we propose a newer clinical application using contrast agent. This has been done in intravascular echography and the contrast has been proved useful for this application
Hoeffel, Christine. "Echographie de contraste et microcirculation tissulaire abdominale. Aspects fondamentaux et applications cliniques". Reims, 2009. http://theses.univ-reims.fr/exl-doc/GED00001104.pdf.
The aim of this work was to study the potential for contrast-enhanced functional ultrasound imaging (Cefui) to assess the abdominal microcirculation, according to three major axes of research: 1) The first axis consisted in proposing and validating a new method improving non invasive contrast-enhanced renal blood flow measurements, using the mean signal intensity in a feeding artery in order to normalize contrast-enhanced renal blood flow estimation. However, while these ex vivo results suggest that this technique has great potentials, other parameters, mainly ultrasound beam attenuation, must be taken into account to obtain reproducible measurements. 2) The second axis consisted in evaluating qualitative abdominal Cefui for tumoral detection. For the detection of liver metastases from carcinoid tumor, the first study reports sensitivity values for contrast-enhanced ultrasound similar to those obtained with enhanced computed tomography. The second study demonstrates that Cefui provides high specificity and predictive values for the early detection of residual tumor after radiofrequency ablation of renal tumors even though its sensitivity remains lower than that of contrast-enhanced CT. 3) The third axis deals with added diagnostic value in terms of characterization of renal tumors of quantitative assessment of tumor perfusion compared to that of qualitative analysis. Abdominal Cefui has unique advantages including low cost, availability, absence of renal toxicity and radiation, and excellent temporal resolution. However, it still requires improvements and standardization to be reproducible and be transferred to the clinical setting. It may somehow yield quantitative information with respect to abdominal organs microcirculation. Further studies correlating Cefui results with those of other functional imaging methods are needed
Clauzon, Vivien. "Analyse de schémas d'ordre élevé pour les écoulements compressibles". Clermont-Ferrand 2, 2008. http://www.theses.fr/2008CLF21821.
Durning, Bruno. "Simulation, estimation spectrale et imagerie des agents de contraste ultrasonores". Lyon 1, 2006. http://www.theses.fr/2006LYO10097.
In this work, we contribute to make ultrasound contrast agent simpler and more effective to use. First we developed a Simulator of Echo Contrast Imaging (SECI). SECI can simulate ultrasound imaging with contrast agent. It takes into account the probe, the propagating medium, the individual, non linear, response of each bubble. Simulations of bubbles alone, have also been performed, at different MI, transmit frequency, and radius. Then, we validate SECI by comparison with in-vitro experiments. An experimental study of the influence of the MI over the contrast agent behavior has been done. Finally, visualization techniques, based on spectral estimation, auto-regressive modelization, and atomical projection have been tested on in-vitro and in-vivo acquisition
Beaulieu, Mathilde. "Imagerie optique à très haut contraste : une approche instrumentale optimale". Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4040/document.
This thesis aims to optimize high-contrast imaging performance in visible and near infrared for exoplanet detection. The main study focuses on high-contrast at small separation, to image exoplanets in their habitable zone. This direct detection is achievable with the next Extremely Large Telescopes and with the development of coronagraph providing high performance at small separation. The approach adopted for this study creates a high-contrast region (a dark hole) with the combination of coronagraphy and wavefront shaping (wavefront control of both phase and amplitude with 2 deformable mirrors) but is limited by the Fresnel propagation of phase aberrations. The goal of this work is to define the wavefront shaping limitation in optical configuration (deformable mirrors location, component optical quality, beam diameter). A semi-analytic approach followed by a Monte-Carlo analysis of numerical end-to-end simulations is studied, resulting in the definition of the optimal configuration. Results are then applied to SPEED, a test bench to optimize and test high-contrast imaging at small separation with a segmented pupil. Another aspect of this thesis is a contribution to a stability study to treat the temporal stability as a crucial parameter in high-contrast imaging instrumentation, at the conception level. A preliminary work is initiated during the thesis to analyse the stability of the measuring instrument itself. A metrology tool and its thermal behaviour are thus studied. Finally, the last part of this thesis is a performance analysis of a new differential imaging technique, developed to improve high contrast with observations with different diaphragm sizes
Libri sul tema "Imagerie à contraste élevé":
E, Merbach André, e Tóth Éva, a cura di. The chemistry of contrast agents in medical magnetic resonance imaging. Chichester: Wiley, 2001.
Publishing, SigMa. Rencontrer les Animaux: Livre à Contraste élevé Pour Bébés. Independently Published, 2021.
Parker, Mari J. Mon Premier Livre Noir et Blanc -Mer: Images et Personnages Pour Enfants à Contraste éLevé. Education Sensorielle Pour les Petits Enfants de 0 à 12 Mois. Independently Published, 2020.
Parker, Mari J. Mon Premier Livre Noir et Blanc -Hiver: Images et Personnages Pour Enfants à Contraste éLevé. Education Sensorielle Pour les Petits Enfants de 0 à 12 Mois. Independently Published, 2020.
Parker, Mari J. Mon Premier Livre Noir et Blanc -Noël: Images et Personnages Pour Enfants à Contraste éLevé. Education Sensorielle Pour les Petits Enfants de 0 à 12 Mois. Independently Published, 2020.
Julia, Maria Albert. Mon Premier Calendrier de L'Avent: Compte à Rebours Pour Noël, Livre de Bébé à Contraste élevé Pour les Nouveau-Nés 0-12 Mois, Cadeau Pour les Nourrissons et les Nouvelles Mamans. Independently Published, 2022.
Growsky, Tom. Mon Premier Livre Noir et Blanc - Calendrier de L'Avent: Livre de Bébé à Contraste élevé Pour les Nouveau-Nés 0-12 Mois, Excellent Cadeau Pour les Nourrissons et les Nouvelles Mamans Pour Noël. Independently Published, 2022.
(Editor), André E. Merbach, e Éva Toth (Editor), a cura di. The Chemistry of Contrast Agents in Medical Magnetic Resonance Imaging. Wiley, 2001.
Lakeman, Doris. Livre en Noir et Blanc Pour Bébé dès la Naissance. Mon Premier Noël en Famille. 0 - 6 Mois: Livre d'images à Contraste élevé Pour Nouveau-Né. Bonhomme de Neige, Père Noël, Rennes et Plus Encore. Independently Published, 2020.
Weber, Gisbert. Mon Premier Noël, Livre de Bébé à Contraste élevé Pour les Nouveau-Nés, 0-12 Mois: Jolies Images en Noir et Blanc Pour les Bébés dès la Naissance, Excellent Cadeau de Noël Pour les Nouvelles Mamans. Independently Published, 2022.
Capitoli di libri sul tema "Imagerie à contraste élevé":
MIRAUX, Sylvain ,., Frank KOBER e Emmanuel Luc BARBIER. "Imagerie vasculaire : flux et perfusion". In Les enjeux de l’IRM, 147–76. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9113.ch6.
Millet, Ingrid. "Produits de contraste et insuffisance rénale : recommandations". In Imagerie de L'appareil Urinaire de L'adulte, 15–20. Elsevier, 2023. http://dx.doi.org/10.1016/b978-2-294-77442-3.00002-5.