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Abstract #1765

Feasibility of Fast MR-Thermometry During Cardiac RF Ablation

Baudouin Denis De Senneville1, Sbastien Roujol1, Pierre Jas2, Chrit T. W. Moonen1, Gwenal Herigault3, Bruno Quesson1

1Laboratory for Molecular & Functional Imaging: From Physiology to Therapy, CNRS/University of Bordeaux 2, Bordeaux, Gironde, France; 2Hpital Cardiologique du Haut-Lvque, Bordeaux, France; 3Philips Healthcare, France

On-line MR-temperature monitoring during radio-frequency ablation of cardiac arrhythmias may improve the efficacy and safety of the treatment. Magnetic Resonance Imaging can provide rapid and quantitative thermometric measurements in addition to a detailed anatomical information. For this purpose, cardiac triggering and dynamic navigator-based slice tracking were combined with image registration and modeling of susceptibility changes with respiration, in order to investigate the precision of PRF thermometry during a RF ablation in-vivo on a sheep heart.