Caractérisation de texture d'échographie RF par champ markovien.

Abstract : The ultrasound is a medical imaging tool that imposes itself for the diagnosis of numerous pathologies. As a consequence, many image filed studies are concerned with these images to provide tools of analysis and tissue characterization. The objective of this thesis is to exploit spatial markovien models representing the ultrasound texture that exist in the image to extract susceptible interactions that would describe the organization of these textures. In the first part, we evaluate the efficiency of the distributions proposed in the previous study modeling the RF envelope amplitude.We illustrate, through texture simulations, the links between the parameters of these distributions and the parameters of the scatterers, namely the density, the amplitude and the spacing. In the second part, we elaborate our texture spatial models inspired by the probability modeling RF envelope amplitude. So we obtain in every pixel of the image a local distribution of type K or Nakagami. Simulation and parameter estimation were developed. The third part is dedicated to the application of the spatial models on RF simulated images. We show here the adequate models for the description of the spatial arrangement of the scatterers constituting the tissue, and the connection of the model parameters with the intrinsic properties of the scatterers. Finally, the future development of this approach are to be discussed.
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Nizar Bouhlel. Caractérisation de texture d'échographie RF par champ markovien.. Mathématiques [math]. Université René Descartes - Paris V, 2006. Français. ⟨tel-00168529v2⟩

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