Variations de charge d'antennes radio-fréquence pour la mesure de signaux physiologiques en imagerie cardiaque par résonance magnétique

Abstract : Especially in cardiac and thoracic magnetic resonance imaging, respiratory motion and heart movement need to be registered using sensors like electrocardiogram or respiratory belts, in order to trigger the image acquisition or perform retrospective corrections. The placement of the sensors extends the patient preparation time, is critical for signal quality and, hence, image quality, and expects patients to tolerate additional sensors besides the imaging coil and space restrictions. In this work, the imaging coil itself was investigated for sensor-less motion registration. Motion-related variations of the electromagnetic properties of tissue have a direct effect on the coil impedance. Lung motion, myocardial-related motion, and vascular blood flow were registered with this method. The experimental findings were compared to electromagnetic simulations and the data gathered by state-of-the-art sensors, and retrospective motion correction with the GRICS algorithm was executed
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Guido Peter Kudielka. Variations de charge d'antennes radio-fréquence pour la mesure de signaux physiologiques en imagerie cardiaque par résonance magnétique. Other. Université de Lorraine, 2016. English. ⟨NNT : 2016LORR0071⟩. ⟨tel-01752265⟩

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