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Abstract #3765

B1 correction in SPatiotemporal ENcoding (SPEN) MRI

Rita Schmidt 1 , Jean-Noel Hyacinthe 2 , Andrea Capozzi 3 , Nikolas Kunz 4 , Rolf Gruetter 4,5 , Arnaud Comment 3 , Lucio Frydman 1 , and Mor Mishkovsky 5

1 Chemical Physics, Weizmann Institute of Science, Rehovot, Israel, 2 School of health, University of Applied Sciences and Arts Western Switzerland, Geneva, Switzerland, 3 Institute of the Physics of Biological Systems, Ecole Polytechnique Fdrale de Lausanne (EPFL), Lausanne, Switzerland, 4 Center of biomedical imaging (CIBM), Ecole Polytechnique Fdrale de Lausanne (EPFL), Lausanne, Switzerland, 5 Laboratory of Functional and Metabolic Imaging, Ecole Polytechnique Fdrale de Lausanne (EPFL), Lausanne, Switzerland

A general challenge of doing MRI with surface coils arises from the strong inhomogeneity of the radio-frequency (RF) field. This challenge also arises in ultrahigh field human MRI applications. Hybrid spatiotemporal encoding (SPEN) sequence is a new alternative for ultrafast acquisition, which recently was demonstrated providing higher immunity to B0 inhomogeneity compared to Echo Planar Imaging (EPI). The aim of the present work was to use SPEN scheme to correct for the B1 inhomogeneity by compensating in the chirped RF pulse amplitude for the spatial B1 distribution. Phantom as well as in-vivo animals experiments were conducted in 9.4 T MRI.

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