Abstract #4984

Off-resonance encoded fat suppression methods for 5D whole-heart free-running cardiac MRI at 1.5T

Yasaman Safarkhanlo^1,2, Jerome Yerly^3,4, Mariana Falcao³, Adèle LC Mackowiak^2,3,5, Davide Piccini^3,6, Matthias Stuber^3,4, Bernd Jung^2,5, Christoph Gräni^1,2, and Jessica AM Bastiaansen^2,5

¹Department of Cardiology, University Hospital Bern, Inselspital, Bern, Switzerland, ²Translation Imaging Center (TIC), Swiss Institute for Translational and Entrepreneurial Medicine, Bern, Switzerland, ³Department of Diagnostic and Interventional Radiology, Lausanne University Hospital (CHUV), Lausanne, Switzerland, ⁴Center for Biomedical Imaging, Lausanne, Switzerland, ⁵Diagnostic, Interventional and Pediatric Radiology (DIPR), University Hospital Bern, Inselspital, Bern, Switzerland, ⁶Advanced Clinical Imaging Technology, Siemens Healthineers International AG, Lausanne, Switzerland

Synopsis

Keywords: Heart, Fat, data acquisition, data analysis, image reconstruction, low-field MRI The presence of fat signals around the heart can affect the diagnostic quality of cardiovascular MR images. There are multiple fat-suppression pulses, such as FISS, and off-resonance water-excitation (WE) pulses, such as BORR, LIBRE, and LIBOR, that have been developed for the free-running balanced Steady-State Free-Precession (bSSFP) sequences at low-field MRI (1.5T). These fat-suppression pulses have never been thoroughly compared to each other, therefore, in this work, we implemented four different fat-suppression pulses and validated their performance on phantoms and healthy volunteers. Our results indicated LIBOR provided better fat suppression compared to BORR and LIBRE, while having fast acquisition time.

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