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Correction d'aberrations et quantification de vitesse du son en imagerie ultrasonore ultrarapide

Abstract : Echography relies on the transmission of ultrasound signals through biological tissues, and the processing of backscattered echoes. The rise of ultrafast ultrasound imaging gave access to physiological events faster than 10 000 frames per second. It allowed therefore the development of high-end techniques such as organs elasticity imaging or sensitive quantification of blood flows. During its propagation through complex or heterogeneous media, the acoustic wavefront may still suffer strong distorsions; hindering both the image quality and the ensuing quantitative assessments. Correcting such aberrations is the ultimate goal of the research work conducted during this PhD. By studying statistical properties of interferences between scatterers, a matrix formalism has been developed to optimise the angular coherence of backscattered echoes. Importantly, we succeeded for the first time, in correcting images and quantifying locally the speed of sound at ultrafast frame rates. Sound speed was proven to be a unique biomarker in the example of hepatic steatosis, and possibly separation of brain white and black matter. The phase correction method will be an interesting contribution to motion correction in the case of 3D tomography and vascular imaging, offering thus new horizons to ultrasound imaging.
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Submitted on : Sunday, October 3, 2021 - 1:02:09 AM
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Hanna Bendjador. Correction d'aberrations et quantification de vitesse du son en imagerie ultrasonore ultrarapide. Acoustique [physics.class-ph]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLS011⟩. ⟨tel-03363091⟩

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