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Commande optimale appliquée aux systèmes d'imagerie ultrasonore

Abstract : Medical ultrasound imaging systems have greatly improved the clinical diagnosis by improving the image quality thanks to more sensitive systems and post-processings. The scientific community has made a great effort of research on post-processing and on encoding the excitation. The methods of the optimal control have been neglected. Our work has focused on the optimal methods based on the feedback from output to input. We have transformed the complex problem of optimal control into an easier suboptimal parametric problem. We apply the principle of optimal control to the ultrasound imaging, the ultrasound harmonic imaging and to the constrast harmonic imaging with or without encoding. The simplicity of the method has allowed us to adapt it to harmonic imaging by a change in the cost function. This adaptation shows that our method can usually be applied to the ultrasound imaging. Nowadays, the stakes of the ultrasound imaging focus not only on the excitation processings or image processings but also on the sensors. This point naturally leads us to seek the optimal control of the capacitive transducers (cMUT) in order to adapt them to the encoded ultrasound imaging. Our compensation and encoding methods by optimal control provide very promising results that go beyond our expectations. The application scope of our methods of optimal control is large and we do not see all the limits yet. The main advantage of our approaches is the easiness of their use and of their implementation. Indeed, our approaches do not require any a priori knowledge on system and medium explored. Our system automatically adapts itself to the changes which may be related to sensor ageing or to the medium change.
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Contributor : Ménigot Sébastien <>
Submitted on : Monday, January 9, 2012 - 4:09:55 PM
Last modification on : Monday, December 14, 2020 - 3:28:22 PM
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  • HAL Id : tel-00657980, version 1




Sébastien Ménigot. Commande optimale appliquée aux systèmes d'imagerie ultrasonore. Imagerie. Université François Rabelais - Tours, 2011. Français. ⟨NNT : 2011TOUR3301⟩. ⟨tel-00657980⟩



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