Robust large-volume fat suppression in whole-heart free-breathing self-navigated coronary MR angiography at 3T using lipid insensitive binomial off-resonant excitation (LIBRE) pulses
Jessica AM Bastiaansen1, Davide Piccini1,2, Ruud B van Heeswijk1,3, and Matthias Stuber1,3
1Department of Radiology, University hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland, 2Advanced Clinical Imaging Technology, Siemens Healthcare, Lausanne, Switzerland, 3Center for Biomedical Imaging, Lausanne, Switzerland
volume fat suppression is increasingly challenging at high magnetic field
strengths due to B0 and B1 inhomogeneities. In this study, we developed a novel
lipid-insensitive binomial off-resonant (LIBRE) radiofrequency excitation pulse
to achieve near-complete fat suppression in large 3D volumes and applied it to
whole-heart coronary imaging at 3T. In 6 healthy volunteers, we performed free-breathing
self-navigated whole-heart 3D radial coronary MRA, and quantitatively compared
the results to more commonly used methods for lipid nulling. We show that LIBRE
significantly improves the signal nulling of lipid resonances resulting in both
improved blood pool delineation for self-navigation and increased vessel conspicuity
in the final images.
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