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Abstract #4823

Potential of parallel transmission for fetal imaging in reducing SAR and mitigating flip angle inhomogeneities: a simulation study at 3T

Filiz Yetisir1, Esra Abaci Turk2, Bastien Guerin3,4, Ellen Patricia Grant2, Lawrence L. Wald3,4,5, and Elfar Adalsteinsson1,5,6

1Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 2Fetal-Neonatal Neuroimaging & Developmental Science Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, United States, 3Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 4Department of Radiology, Harvard Medical School, Boston, MA, United States, 5Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States, 6Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States

In this work we evaluate the potential benefits of parallel transmission for fetal imaging in reducing local SAR and mitigating flip angle inhomogeneities. Our results show that compared to single channel transmission, using 2 channel parallel transmission with a 2 port birdcage coil, local SAR can be reduced by a factor of up to 5 and flip angle inhomogeneity can be mitigated by up to 66% for realistically long RF pulses.

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