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Abstract #3222

Experiments and Analysis of Virtual Observation Points at 7T

Yujuan Zhao 1 , Tiejun Zhao 2 , and Tamer Ibrahim 1

1 University of Pittsburgh, Pittsburgh, Pennsylvania, United States, 2 Siemens Medical Solutions USA, Pittsburgh, Pennsylvania, United States

PTX excitation may create distinct hot spots inside the human body by constructive interference of electric fields generated by the respective coil elements driven with individual amplitudes and phases. Monitoring global and local peak SAR is a challenging task. In this study, the system global power and the local SAR from Virtual Observation Points (VOP) model in conjunction with rigorous RF modeling that incorporates coupling are demonstrated and verified in-vivo by experiments acquired using the Parallel RF transmission system. The input simulated SAR model is also verified quantitatively using B1+ maps as well as local VOP SAR monitoring.

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