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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