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Abstract #1564

Fat-free MRI with fast and power-optimized off-resonant LIBOR pulses

Jessica AM Bastiaansen1,2, Davide Piccini3, and Adele Mackowiak4
1Department of Diagnostic, Interventional and Pediatric Radiology (DIPR), Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland, 2Translational Imaging Center, sitem-insel, Bern, Switzerland, 3Advanced Clinical Imaging Technology, Siemens Healthcare, Lausanne, Switzerland, 4Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland


Flexible off-resonant RF pulse designs such as LIBRE and BORR are inspired by conventional binomial 1-(180)-1 water excitation pulses and perform better in terms of fat suppression. To abbreviate scanning times, BORR and LIBRE pulse durations can be shortened by increasing the RF excitation frequency at the expense of increased RF power. To reduce RF power, we developed a novel off-resonant RF pulse design based on the conventional 1-(90)-1 water excitation pulse. LIBOR, compared with LIBRE and BORR, reduced the required RF power while maintaining short pulse durations and effective fat suppression in simulations, knee, and cardiac MRI at 3T.

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