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Abstract #0006

Evaluation of cardiac magnetic resonance thermometry in patients

Valery Ozenne1, Solenn Toupin1,2, Pierre Bour1, Baudouin Denis de Senneville3, Alexis Vaussy2, Matthieu Lepetit-Coiffé2, Pierre Jaïs4, Hubert Cochet4, and Bruno Quesson1

1Electrophysiology and Heart Modeling Institute, Bordeaux, France, 2Siemens Healthcare, Paris, France, 3Mathematical Institute of Bordeaux, Bordeaux, France, 4Department of Cardiac Electrophysiology, Hôpital Cardiologique de Haut-Lévêque, Bordeaux, France

Recent studies have proposed to monitor radiofrequency ablation on the heart using real-time MR-thermometry. Methods rely on ECG triggering which can fail in presence of arrhythmia. This study evaluates the precision of MR-thermometry on patients (N=15) even in presence of cardiac arrhythmia. Phase images were acquired using a single-shot multi-slice echo planar imaging and temperature maps were calculated and displayed on the fly. ECG was recorded simultaneously for further analysis of cardiac rhythm and post-processing of temperature images. Stability of temperature mapping without RF-heating was evaluated in each pixel and correlated to the prevalence of arrhythmia.

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