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Abstract #1646

Trajectory correction enables Free running cardiac DIXON at 3T

Pierre Daudé1,2, Thomas Troalen3, Adèle L C Mackowiak4,5, Davide Piccini4,6, Jerôme Yerly4,5, Josef Pfeuffer7, Frank Kober1,2, Sylviane Confort Gouny1,2, Monique Bernard1,2, Matthias Stuber4,5, Jessica A M Bastiaansen4,5,8,9, and Stanislas Rapacchi1,2
1Aix-Marseille Univ, CNRS, CRMBM, Marseille, France, 2APHM, Hôpital Universitaire Timone, CEMEREM, Marseille, France, 3Siemens Healthcare SAS, Saint-Denis, France, 4Department of Diagnostic and Interventional Radiology, Lausanne University Hospital, Lausanne, Switzerland, 5Center for Biomedical Imaging, Lausanne, Switzerland, 6Advanced Clinical Imaging Technology, Siemens Healthcare, Lausanne, Switzerland, 7Siemens Healthcare, MR Application Development, Erlangen, Germany, 8Department of Diagnostic, Interventional and Pediatric Radiology, Bern University Hospital (Inselspital), Bern, Switzerland, 9Translational Imaging Center, sitem-insel, Bern, Switzerland


Free-running cardiac DIXON-MRI has potential for T2*/PDFF quantification to explore cardiac fat accumulation and alteration in metabolic diseases. DIXON at 3T suffers from rapid fat-water phase accrual and inhomogeneous B0. Consequently, bipolar echoes, as opposed to monopolar, are required to achieve equal/shorter than in-phase/out-of-phase echo spacing. However, distortions occur between even and odd echoes due to gradients imperfections. Thus, the existing framework was extended with a k-space trajectory correction based on gradient impulse response function(GIRF). Both monopolar or bipolar echoes without GIRF correction resulted in fat-water swaps and unreliable quantitative maps, that were resolved using GIRF-corrected bipolar free-running DIXON.

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