Abstract #0811
Comparison of local SAR and temperature increase between 1.5T and 3T in fetal MRI across five numerical pregnant body models
Filiz Yetisir1, Esra Abaci Turk1,2, Judy A Estroff3,4, Carol Barnewolt3,4, Elfar Adalsteinsson5,6,7, Patricia Ellen Grant1,2,3, and Lawrence L Wald6,8,9
1Fetal-Neonatal Neuroimaging and Developmental Science Center, Boston Children's Hospital, Boston, MA, United States, 2Department of Pediatrics, Boston Children's Hospital, Boston, MA, United States, 3Department of Radiology, Boston Children's Hospital, Boston, MA, United States, 4Maternal Fetal Care Center, Boston Children's Hospital, Boston, MA, United States, 5Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 6Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, United States, 7Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 8Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 9Department of Radiology, Massachusetts General Hospital, Boston, MA, United States
Synopsis
3T can improve fetal MRI compared to 1.5T, but concerns over increased RF safety risk for the fetus exist due to higher field nonuniformity. Previous studies comparing fetal SAR between two field strengths used either a single pregnant body model or artificial pregnant body models. In this study, we compare SAR and temperature increase in the fetus and mother at 1.5T and 3T using 5 anatomically realistic and diverse pregnant body models. Across these models, we find similar or lower levels of fetal SAR and temperature increase at 3T compared to 1.5T.
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