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Abstract #2868

Whole-liver flip angle shimming at 7T using eight-channel parallel transmission kt-points pulses with FPE-DREAM B1+ mapping

Bobby Runderkamp1, Wietske van der Zwaag2, Thomas Roos2, Gustav Strijkers3, Matthan Caan3, and Aart Nederveen1
1Radiology & Nuclear Medicine, Amsterdam UMC, Amsterdam, Netherlands, 2Spinoza Center for Neuroimaging, Amsterdam, Netherlands, 3Biomedical Engineering and Physics, Amsterdam UMC, Amsterdam, Netherlands


Liver MRI could benefit from the increased SNR at 7T but suffers from severe flip angle inhomogeneity. In this work, eight-channel parallel transmission is used for flip angle shimming, comparing circularly polarized transmission and phase shimming with a kt-points pulse. Fourier phase-encoded DREAM is used for artifact-free B1+ mapping. With kt-points, the nominal flip angle of 8˚ could be achieved with homogeneous signal over the entire liver, while phase shimming only delivers a flip angle of approximately 4˚ with less homogeneity. Future work is directed towards use of universal slab-selective kt-points pulses to make 7T liver MRI clinically feasible.

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