Abstract #0974

Real-time catheter tracking for cardiac MR-Thermometry during RF-ablation

Pierre Bour ^1,2,3, Valéry Ozenne^1,2,3, Marylène Delcey ^1,2,3,4, Tom Lloyd⁵, Rainer Schneider⁶, Thomas Pohl⁶, Wadie Ben-Hassen⁴, Pierre Jais^1,2,3,7, and Bruno Quesson^1,2,3

¹IHU-LIRYC, Pessac, France, ²Univ. Bordeaux, Centre de recherche Cardio-Thoracique de Bordeaux, Bordeaux, France, ³INSERM U1045, Bordeaux, France, ⁴Siemens Healthcare, Saint-Denis, France, ⁵Imricor, Brunsville, MN, United States, ⁶Siemens Healthcare, Erlangen, Germany, ⁷Bordeaux University Hospital (CHU), Pessac, France

MR-thermometry in the heart has been developed over the last decade for RF-ablation monitoring to predict ablation outcomes. This study investigates a new approach to compensate respiratory motion. A catheter tracking module was integrated in a single-shot gradient echo echo-planar imaging sequence to dynamically position automatically the stack-of-slices on the catheter tip. As compared to the literature the proposed method uses local displacements at the vicinity of the catheter without prior knowledge relative to the displacement of the heart during respiration. In this study we have investigated the feasibility of this approach in vivo during RF-ablation in sheep.

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