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Abstract #3847

Proof-of-concept of retrospective gating for interventional cardiac MRI using catheter microcoils readings.

Marylène DELCEY1,2,3,4, Pierre BOUR1,3,4, Valery OZENNE1,3,4, Wadie BENHASSEN2, and Bruno QUESSON1,3,4

1IHU LIRYC, PESSAC, France, 2Siemens Healthcare, Saint-Denis, France, 3Univ. Bordeaux, Centre de recherche Cardio-Thoracique de Bordeaux, Bordeaux, France, 4INSERM U1045, Bordeaux, France

In the context of radiofrequency ablation of cardiac arrhythmia, a catheter is inserted into the heart for contact electrophysiology recording and/or ablating the arrhythmogenic substrate. In this context, we propose to exploit MR-compatible microcoils located near the catheter tip to estimate the local motion of the heart. For this, a tracking module was interleaved with segments of a radial acquisition in a FLASH sequence. k-space segments were sorted retrospectively according to tracking readings before image reconstruction. Using this approach, artifact free images of a pig in vivo could be reconstructed.

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