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 Guerin^3,4, Ellen Patricia Grant², Lawrence L. Wald^3,4,5, and Elfar Adalsteinsson^1,5,6

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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