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Abstract #0042

Motion correction strategies for cardiac MR thermometry during RF-ablation.

Valry Ozenne 1 , Solenn Toupin 1,2 , Baudouin Denis de Senneville 3 , Pierre Bour 1 , Fanny Vaillant 1 , Matthieu Lepetit-Coiff 2 , Pierre Jas 1 , and Bruno Quesson 1

1 L'Institut de Rythmologie et Modlisation Cardiaque, Bordeaux, France, 2 SIEMENS Healthcare, Saint Denis, France, 3 IMB, UMR 5251 CNRS/University of Bordeaux, Bordeaux, France

Performing magnetic resonance thermometry during cardiac radiofrequency ablation (RFA) requires dealing with motion and susceptibility artifacts due to cardiac and respiratory motion. In this study, the suitability of three in-line thermometry processing methods was evaluated in vivo on the heart of ten healthy volunteers under free breathing conditions. We demonstrated that the temporal temperature standard deviation was minimized with Principal Component Analysis (PCA) based method: 2.2C instead of 2.7C with state-of-the-art multi-baseline method. This approach offers robust motion estimation in regions prone to local signal variations on magnitude images during RFA performed on ex-vivo working pig heart.

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