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Abstract #3216

Anatomical Models of Pregnant Women in 3T pTx Body Coils: Evaluation of SAR and B1+ Optimization in Various Imaging Positions

Manuel Murbach 1 , Esra Neufeld 1 , Eugenia Cabot 1 , Earl Zastrow 1 , Juan Corcoles 2 , Wolfgang Kainz 3 , and Niels Kuster 1,4

1 ITIS Foundation, Zurich, Switzerland, 2 Department of Electronic and Communication Technology, Universidad Autnoma de Madrid (UAM), Madrid, Spain, 3 Center for Devices and Radiological Health (CDRH), US Food and Drug Administration (FDA), Silver Spring, MD, United States, 4 Swiss Federal Institute of Technology (ETH), Zurich, Switzerland

In this study, we investigate the effects of pTx multitransmit body-coils at 3 T on anatomical models of a pregnant woman with her fetus at three different stages of gestation. Various imaging positions, regions of interest (ROI), and pTx coil excitation vectors are evaluated for effect on SAR and B1+ uniformity. The B1+ uniformity can increase by a factor of >4. The more equalized field distribution for large ROI typically leads to lower local SAR. However, the worstcase excitations identified lead to extremely high local SAR enhancement, emphasizing the need for robust management of exposure safety.

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