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
L'Institut de Rythmologie et Modlisation
Cardiaque, Bordeaux, France,
Healthcare, Saint Denis, France,
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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