Добірка наукової літератури з теми "Thérapie ultrasonore"
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Статті в журналах з теми "Thérapie ultrasonore":
Messas, E. "Un traitement non invasif par thérapie ultrasonore du rétrécissement aortique calcifié." Archives des Maladies du Coeur et des Vaisseaux - Pratique, September 2023. http://dx.doi.org/10.1016/j.amcp.2023.05.001.
Дисертації з теми "Thérapie ultrasonore":
Pernot, Mathieu. "Nouvelles techniques de thérapie ultrasonore et de monitoring." Phd thesis, Université Paris-Diderot - Paris VII, 2004. http://pastel.archives-ouvertes.fr/pastel-00000992.
Cao, Elodie. "Développement d’une sonde ultrasonore oesophagienne pour la thérapie cardiaque." Electronic Thesis or Diss., Lyon, 2022. http://www.theses.fr/2022LYSE1013.
Ventricular arrhythmias are a major public health issue. Sudden cardiac death is responsible for 200,000 to 350,000 deaths in Europe, each year. Radiofrequency ablation is the gold standard to treat these pathologies. The procedure consists in ablating or isolating electrically arrhythmogenic regions. However, its efficiency is limited. High intensity focused ultrasound is a promising alternative through its ability to create precise thermal lesions deeply, at distance from the transducer, without damaging intervening tissues. Esophageal approach offers a good acoustic window on the heart. Thus, transesophageal ultrasonic probe could create transmural thermal lesions on ventricular walls. A transesophageal 2.6-MHz plane ultrasound probe, composed of 32 therapy rings and two perpendicular bimodal imaging transducers was developed to guide procedures and to treat targeted regions located at a maximum distance of 10 cm. It was characterized acoustically. Then, in vitro experiments on cardiac tissues and ex vivo experiments on isolated perfused porcine hearts were conducted to confirm the probe ability to create lesions. The aim was achieved in vitro but the technical limits and the complex heart model prevent the probe from creating lesions ex vivo. A numerical model to simulate HIFU thermal ablations in mobile and deformable heart was also developed to predict how motion affects HIFU treatment efficiency. Experiments on thermosensitive gels validated the model ability to determine lesion volume in gel. However, experiments conducted on Langendorff hearts demonstrated that there was a difference between numerical and experimental results. Thus, the model is not accurate enough to compute precise temperature measurements in mobile and perfused heart during HIFU treatment, but it can provide relative results on heating variation
Berti, Romain. "Caractérisation d'agents de contraste ultrasonore pour l'imagerie et la thérapie." Paris 6, 2010. http://www.theses.fr/2010PA066711.
Aubry, Jean-François. "Focalisation ultrasonore adaptative : application à l'imagerie et à la thérapie du cerveau." Paris 7, 2002. http://www.theses.fr/2002PA077012.
Gateau, Jérôme. "Imagerie ultrasonore ultrarapide d'évènements de cavitation : application en thérapie par ultrasons et imagerie de détection." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://pastel.archives-ouvertes.fr/pastel-00863591.
Gross, Dominique. "Conception et évaluation d'une sonde CMUT mixte dédiée à la thérapie ciblée à guidage ultrasonore." Thesis, Tours, 2015. http://www.theses.fr/2015TOUR3313/document.
Presented for the first time in 1994, capacitive micromachined ultrasonic transducers (CMUT) are a promising alternative to the piezoelectric technology for electroacoustic transduction. Particularly, their intrinsic design flexibility and miniaturization capability are strong advantages for the manufacturing of high-end Ultrasound-guided Focused Ultrasound (USgFUS) probes. The work presented in this Ph.D. dissertation is devoted to the f irst development of a USgFUS CMUT probe. After a general introduction of the CMUT technology and the context of this research project, the development is reported starting from the preliminary numerical studies to the most advanced characterizations of the fabricated device. The first results demonstrate the benefits of this technology for the targeted applications
Gâteau, Jérôme. "Imagerie ultrasonore ultrarapide d'événements de cavitation : application en thérapie par ultrasons et imagerie de détection." Paris 7, 2011. http://www.theses.fr/2011PA077013.
The onset of cavitation activity in an aqueous medium is linked to the formation of gas/vapour-filled cavities of micrometric size. This formation can be acoustically mediated and is then called acoustic bubble nucleation. We focus here in the activation of seed nucléi by short (a few cycles) and high amplitude ultrasonic excitation (order of magnitude MPa). Bubbles are generated during the rarefaction phase of the wave and are transient (they dissolve). The nucleation properties of biological tissues are little known. However, they can be assessed using ultrasound: the formation of a bubble results in the appearance of a new scatterer (which can be detected with a pulse-écho detection), and each cavitation event generates an acoustic emission (detected with passive reception). In n this PhD manuscript, we use ultrafast ultrasound imaging (simultaneous acquisition on an array of transducers with a high frame rate) to detect cavitation events. Two in vitro applications were first validated. On one hand, bubble nucleation was performed through a human skull, and transcranial passive detection of a single cavitation event was used in a time reversal process to optimize adaptive focusing for thermal therapy of brain tissue. On the other hand, the formation and dissolution of bubbles in scattering biological tissues (muscle) were detected with a high sensitivity by combining passive detection and ultrafast active imaging. Finally, in vivo experiments on sheep's brain, and others in vitro on animal blood showed that nucleation in biological tissue is a random phenomenon, and high negative pressure are mandatory to initiate nucleation in vivo (< -12MPa)
Daunizeau, Loïc. "Développement de la thérapie ultrasonore conformationnelle par voie interstitielle pour le traitement du carcinome hépatocellulaire." Electronic Thesis or Diss., Lyon, 2020. http://www.theses.fr/2020LYSE1326.
Hepatocellular carcinoma is the most common primary cancer of the liver. Interstitial thermal ablation procedures constitute a type of curative treatments for this cancer. Given the physical nature of the phenomenon used to modify temperature (radio frequency, micro wave, laser, cryotherapy), those methods may not be able to generate a conformal treatment for a given tumor shape. In some cases, this limitation may induce the thermal ablation of a large volume of non-tumor tissues. The use of an ultrasound interstitial probe mounted with a multi-element transducer capable of generating high intensity focused ultrasound (HIFU) may theoretically help to overcome this limitation. Also a transducer with an important number of elements may also provide in situ imaging. As a first step, the design of a transducer for interstitial ultrasound probe was studied. A specific configuration has been proposed for the treatment of tumors with a diameter of 4 cm. The question of the treatment planning method to adopt to reach an optimal conformal treatment has been then addressed by comparing numerical simulations of different strategies. All strategies were sufficiently conformal and none presented real assets compared to the others. Ultrasound focusing in itself provided the desired conformal thermal ablation. Finally, a robotic platform was developed for driving interstitial dual mode ultrasound probes, both in imaging and in therapy mode. This platform allowed the automatic treatment planning of in vitro tumor mimic phantoms, based on 3D ultrasound reconstruction from the B mode images obtained in situ by the interstitial probe. However, in therapy mode, the probes did not reach their specifications and did not manage to create thermal lesions in in vitro liver tissue sample. The modularity of the robotic platform allowed driving a different HIFU system, which was more robust. With this system, the platform managed to perform with success an automatic treatment planning and then the associated HIFU treatment in in vitro tissue sample
Tanter, Mickael. "Application du retournement temporel à l'hyperthermie ultrasonore du cerveau." Paris 7, 1999. https://pastel.archives-ouvertes.fr/pastel-00650031.
Prost, Amaury. "Imagerie photoacoustique : application au contrôle de la thérapie ultrasonore et étude de la génération par des nanoparticules d'or." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-01068272.