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Abstract #1196

Evaluation of 2D simultaneous multi-slice EPI at 1.5T for MR-thermometry in presence of motion.

Valéry Ozenne1,2,3, Pierre Bour1,2,3,4, Baudouin Denis De Senneville5, Marylene Delcey1,2,3,6, Wadie Ben Hassen7, Alexis Vaussy7, Rainer Schneider8, and Bruno Quesson1,2,3

1IHU Liryc, Electrophysiology and Heart Modeling Institute, Fondation Bordeaux Université, Bordeaux, France, 2Univ. Bordeaux, Centre de recherche Cardio-Thoracique de Bordeaux, U1045, Bordeaux, France, 3INSERM, Centre de recherche Cardio-Thoracique de Bordeaux, U1045, Bordeaux, France, 4Image Guided Therapy SA, Bordeaux, France, 5Institute of Mathematics of Bordeaux, UMR 674 5251, Bordeaux, France, 6Siemens Healthineers, Saint Denis, France, 7Siemens Healthcare, Saint Denis, France, 8Siemens Healthcare, Erlangen, Germany

Temperature mapping in presence of respiratory motion can accommodate intra-scan motion using fast 2D-EPI sequence but inter-scan motion remains a challenge during free-breathing acquisition. To address this limitation, we evaluated, in vitro on a mobile gel, a 2D simultaneous multi-slice EPI sequence with a slice acceleration factor up to 3 during radiofrequency ablation. Inter-scan motion and temperature elevation measured with accelerated sequences are compared to reference values using a non-accelerated sequence. Additionally, evidence or absence of potential false-positive heating are considered.

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