Abstract #0304

Correcting vs resolving respiratory motion in accelerated free-running whole-heart radial flow MRI using focused navigation (fNAV)

Mariana Baginha da Lança Falcão¹, Giulia M. C. Rossi¹, Liliana Ma^2,3, John Heerfordt^1,4, Davide Piccini^1,4, Jérôme Yerly^1,5, Milan Prša⁶, Tobias Rutz⁷, Estelle Tenisch¹, Michael Markl^2,3, Matthias Stuber^1,5, and Christopher W. Roy¹

¹Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland, ²Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, United States, ³Department of Biomedical Engineering, Northwestern University, Chicago, IL, United States, ⁴Advanced clinical imaging technology, Siemens Healthcare AG, Lausanne, Switzerland, ⁵Center for Biomedical Imaging (CIBM), Lausanne, Switzerland, ⁶Woman-Mother-Child Department, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland, ⁷Service of Cardiology, Centre de resonance magnétique cardiaque (CRMC), Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland

In this work, a free-running radial whole-heart flow sequence was acquired in five congenital heart disease patients and images were reconstructed using a) a previously developed 5D flow framework for respiratory and cardiac resolved images, and b) a novel framework for respiratory motion corrected and cardiac resolved 4D flow (fNAV). Image and flow differences were measured across a range of acceleration factors. We showed that the free-running acquisition, which is already undersampled, can be even further accelerated with less signal degradation if it is reconstructed with fNAV 4D flow, compared to using 5D flow.

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