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<dc:title xml:lang="en">Interventional magnetic resonance elastography dedicated to the monitoring of percutaneous thermal ablations</dc:title>
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<dc:subject xml:lang="fr">Imagerie par Résonance Magnétique</dc:subject>
<dc:subject xml:lang="fr">Ablation thermique</dc:subject>
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<dc:subject xml:lang="en">Elastography</dc:subject>
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<dcterms:abstract xml:lang="fr">Les ablations thermiques percutanées guidées par IRM sont actuellement contrôlées en temps réel grâce à la thermométrie IRM. Cependant, aucune information directement associée aux changement de propriétés intrinsèques du tissu n’est disponible pendant la procédure. Ces travaux offrent la possibilité d’un monitorage plus complet des ablations thermiques grâce à l’Elastographie par Résonance Magnétique (ERM) combinée à la thermométrie IRM. Le système proposé est composé d’un excitateur à aiguille, d’une séquence d’encodage du mouvement synchronisée sur la respiration et d’une méthode de reconstruction en temps réel de carte d’élasticité et de température. Les changements d’élasticité et de température se produisant lors d’ablations thermiques par laser ont été mesurés in vivo en temps réel avec succès grâce à ce système. Une nouvelle méthode de traitement des données ERM sans reconstruction d’images de phase est aussi proposée afin de s'affranchir d'étapes conventionnelles fastidieuses.</dcterms:abstract>
<dcterms:abstract xml:lang="en">MR-guided percutaneous thermal ablations are currently monitored by MR thermometry. However, no information related to intrinsic property changes of the tissue is available during the procedure. The feasibility of monitoring in vivo thermal ablations by simultaneous Magnetic Resonance Elastography (MRE) and MR-thermometry is demonstrated in this work. The interventional MRE system includes a needle MRE driver, a respiratory triggered gradient-echo sequence with motion encoding, and an online reconstruction method that provides elasticity and temperature measurements in real-time. Changes in elasticity and temperature occurring during laser thermal ablations were successfully measured in vivo thanks to this interventional MRE system. An innovative method for MRE data processing without phase image reconstruction is also proposed in order to avoid challenging steps of the conventional process.</dcterms:abstract>
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