Abstract #2556

Local SAR management strategies for RF shimming in fetal MRI at 3T

Filiz Yetisir¹, Esra Abaci Turk^1,2, Elfar Adalsteinsson^3,4,5, Patricia Ellen Grant^1,2,6, and Lawrence L Wald^4,7,8

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 Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, ⁴Harvard-MIT Health Sciences and Technology, Cambridge, MA, United States, ⁵Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Boston, MA, United States, ⁶Department of Radiology, Boston Children's Hospital, Boston, MA, United States, ⁷Athinoula A. Martinos Center for Biomedical Imaging, Harvard Medical School, Boston, MA, United States, ⁸Department of Radiology, Massachusetts General Hospital, Boston, MA, United States

Synopsis

RF shimming (RFS) improves the transmit field for fetal MRI, however, fetal safety is understudied. Previous simulations studied the SAR_local of the standard imaging mode (CP mode) of each subject to inform the safety of RFS. We evaluated two local SAR management strategies which utilize subject-specific models and use either the individual’s CP mode SAR_local as a limit for RFS or the maximum CP mode SAR_local value across 7 subjects. We evaluated the B₁⁺ performance inside the fetus for each strategy. Using the maximum CP mode SAR_localacross the population as the SAR limit greatly improves RFS performance.

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