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Abstract #2182

Metasurface-based pad for improving fetal imaging at 3T

Viktor Puchnin1, Evgeniy Koreshin1, Anna Kalugina1, Aleksander Efimtcev1,2, Irina Mashchenko2, Wyger Brink3, and Alena Shchelokova1
1School of Physics and Engineering, ITMO University, Saint Petersburg, Russian Federation, 2Federal Almazov North-West Medical Research Center, Saint Petersburg, Russian Federation, 3Department of Radiology, C.J. Gorter Center for High‐Field MRI, Leiden University Medical Center, Leiden, Netherlands


Radiofrequency magnetic field homogeneity improvement and SAR reduction are two essential tasks for fetal MRI at 3T. We demonstrate for the first time that the metasurface-based pad can effectively improve the transmit efficiency while reducing SAR within the entire fetus and fetus brain. The metasurface is assembled from the metal wires loaded with capacitors. Numerical studies of a pregnant woman voxel model in the 9th month covered with the proposed metasurface centered within fetus brain (body) showed 25% (28%) transmit efficiency improvement and up to 9% (2.8%) increased magnetic field homogeneity, while the whole-body SAR was reduced by 1.2 (1.6)-fold.

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