Adaptation temps réel de l'acquisition en imagerie par résonance magnétique en fonction de signaux physiologiques

Abstract : Cine MRI of cardiac contraction is a relatively slow imaging technique. Comparatively, patient motion, especially cardiac beating and breathing, are fast and can lead to imaging artefacts. Cardiac contraction velocity provides clinically useful information. Firstly, we have shown that making this measurement was possible using phase contrast Cine MRI, and that getting similar values as those obtained in clinical routine using cardiac echography. The condition is to reach high temporal resolution, but to do so, the acquisition duration must be longer than a breathhold. Free-breathing motion management was done by two approaches: by averaging then by motion compensation using Cine-GRICS. Secondly, in order to achieve high temporal resolution Cine reconstruction, we proposed a way to deal with changing heart rate during Cine MRI acquisition, by the construction of a patient adapted cardiac model using realtime phase contrast MRI. Finally, cardio-respiratory motion management was adapted to small animal Cine MRI thanks to IntraGate echo navigators
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Christophe Meyer. Adaptation temps réel de l'acquisition en imagerie par résonance magnétique en fonction de signaux physiologiques. Autre. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0272⟩. ⟨tel-01751310⟩

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