Gotowa bibliografia na temat „Thérapie HIFU”
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Rozprawy doktorskie na temat "Thérapie HIFU"
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.
Pełny tekst źródłaCao, Elodie. "Développement d’une sonde ultrasonore oesophagienne pour la thérapie cardiaque". Electronic Thesis or Diss., Lyon, 2022. http://www.theses.fr/2022LYSE1013.
Pełny tekst źródłaVentricular 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
Chanel, Laure-Anaïs. "Assistance à la thérapie par ultrasons focalisés de haute intensité (HIFU) : compensation des mouvements physiologiques par asservissement sur images ultrasonores". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAD003/document.
Pełny tekst źródłaHigh Intensity Focused Ultrasound (HIFU) therapy is a non-invasive and non-ionizing method for ablation of solid tumors. However, intra-abdominal organ motion, mainly due to breathing, is a major hurdle for proper targeting of the tumor. In this context, an all-in-one HIFU robotized system with motion compensation in real-time during HIFU treatment was developed. To this aim, an ultrasound visual servoing working at a frequency of 20 Hz, relying on a fast ultrasonic speckle tracking method for motion estimation, was designed. It uses an interleaved imaging/HIFU sonication sequence, with duty cycle of 80 %, in order to avoid wave interferences. The robotized HIFU system was tested on a tissue mimicking phantom undergoing a 1D and a 2D sinusoidal motion. As a result, motion reduction of more than 80 % in 1D for a frequency of 0.25 Hz and more than 90 % in 2D for a frequency of 0.1 Hz was obtained. However, it couldn't be observed a significant effect of motion compensation on the lesions induced by HIFU
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.
Pełny tekst źródłaHepatocellular 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
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.
Pełny tekst źródłaGarnier, Carole. "Segmentation de la prostate pour la thérapie par Ultrasons Haute Intensité guidée par l'image". Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00498035.
Pełny tekst źródłaBing, Fabrice. "Traitement des lésions osseuses par Ultrasons Focalisés de Haute Intensité : de la simulation aux applications cliniques". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD045/document.
Pełny tekst źródłaAfter a “state of art” on bone lesions ablation techniques, bone experimentations presented showed that deep focalisation allows the best lateral periosteal heating. On cement, from which the coefficient α was measured, the same thermic curves were observed. A simulation was done with two values of α (4.7 et 9.9 dB/cm). A higher heating at the periosteal focal point with superficial focalisation and a higher periosteal lateral heating with deep focalisation with a thermic inertia, were confirmed with simulation. Heating was higher with the high α value. A retrospective analysis of the bone lesions treated with minimally invasive treatment showed that 50% of osteoid osteomas and 35.7% of metastases were classified as suitable with MRgHIFU alone. 35.9% additional cases may have been treated with dissection or consolidation. At 1 MHz, US distortion due to the presence of needles in the US cone was observed only with the 13-gauge needle. However, if 18 to 22G needles may induce few distortion, an acoustic barrier may appear if the liquid injected flows in front of the US
Constanciel, Élodie. "Développement d'un applicateur transoesophagien à Ultrasons Focalisés de Haute Intensité à guidage échographique intégré pour le traitement de la fibrillation atriale". Phd thesis, Université Claude Bernard - Lyon I, 2014. http://tel.archives-ouvertes.fr/tel-00985628.
Pełny tekst źródłaAzarnoush, Kasra. "Thérapie cellulaire myocardique". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00719631.
Pełny tekst źródłaConstanciel, Élodie. "Développement d'un applicateur transoesophagien à Ultrasons Focalisés de Haute Intensité à guidage échographique intégré pour le traitement de la fibrillation atriale". Electronic Thesis or Diss., Lyon 1, 2014. http://www.theses.fr/2014LYO10026.
Pełny tekst źródłaAtrial fibrillation (AF) is the most frequent cardiac arrhythmia. This pathology affects more than 750,000 persons in France. Radiofrequency (RF) endocardial ablation is performed to treat this disease and involves the generation of transmural thermal lesions, to isolate electrically the pulmonary veins (PV) from the left atrium. The technique is, however, invasive and has a limited efficiency, especially for ensuring transmurality which requires a perfect contact between the RF probe and cardiac tissues. High Intensity Focused Ultrasound (HIFU) allows the creation of precise thermal lesions, deep within biological tissues. A transesophageal HIFU approach could provide a minimally-invasive alternative for AF treatment, since deep transmural lesions could be generated at distance from the HIFU probe. In this work, an ultrasound-guided transesophageal applicator has been developed for AF treatment. The HIFU transducer, embedding a transesophageal echocardiography (TEE) probe, can focus the acoustic beam from 17 to 55 mm axially and generate a surface acoustic intensity up to 12 W•cm-2. A complex treatment plan, the HIFU Mini-Maze (HIFUMM), was successfully simulated on a realistic anatomical human model. Transesophageal HIFU lesions were induced experimentally in static myocardium, under ex vivo configurations reflecting an increasing complexity in anatomical and physiological conditions. Investigations conducted on shear wave elastography confirmed the feasibility of using TEE to control the formation of HIFU lesions. Finally, in vivo experiments in a porcine model allowed validating the treatment procedure by inducing biological damages in beating heart