Abstract #1646

Trajectory correction enables Free running cardiac DIXON at 3T

Pierre Daudé^1,2, Thomas Troalen³, Adèle L C Mackowiak^4,5, Davide Piccini^4,6, Jerôme Yerly^4,5, Josef Pfeuffer⁷, Frank Kober^1,2, Sylviane Confort Gouny^1,2, Monique Bernard^1,2, Matthias Stuber^4,5, Jessica A M Bastiaansen^4,5,8,9, and Stanislas Rapacchi^1,2

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

Synopsis

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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