Inverse problems and controllability with applications to elasticity and MRI

Abstract : The aim of this thesis is to study the exact controllability and exact observability of some partial differential equations, modeling elastic vibrations of structures and to apply the results obtained in this way to solve some inverse problems provided by magnetic resonance imaging (MRI). This thesis has two parts. In the first part we study the exact controllability and exact observability of Euler-Bernoulli equation perturbed with linear or non-linear terms. Therefore, in Chapter 2 of this work we prove the internal exact observability of the Euler-Bernoulli equation perturbed by a linear term and in Chapter 3 we prove the local exact controllability of a non-linear plate equation due to Berger. Chapter 4 provide a numerical method to approximate the exact controls of vibrating systems. The second part of the thesis is centered to magnetic resonance imaging. More precisely, we are interested on the image reconstruction methods in magnetic resonance imaging of moving objects. Chapter 6 describe a method to reconstruct cardiac images from MR data acquired in free-breathing, reducing the image reconstruction to a problem of moments in a Hilbert space. The solution of this problem of moments is obtained using the same tools as in control theory. A more direct connexion between the two parts of the thesis is provided by Chapter 7 where we describe the inverse problem of the identification of a source term in the wave equation from a measure corresponding to a magnetic resonance signal.
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Nicolae Cindea. Inverse problems and controllability with applications to elasticity and MRI. General Mathematics [math.GM]. Université Henri Poincaré - Nancy 1, 2010. English. ⟨NNT : 2010NAN10010⟩. ⟨tel-01748210⟩

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