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Abstract #0617

The ultimate SNR and SAR in realistic body models

Bastien Guerin 1 , Jorge F Villena 2 , Athanasios G Polimeridis 2 , Elfar Adalsteinsson 2,3 , Luca Daniel 2 , Jacob White 2 , and Lawrence L Wald 1,3

1 A. A. Martinos Center for Biomedical Imaging, Dpt. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 2 Dpt. of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 3 Division of Health Sciences Technology, Harvard-MIT, Cambridge, MA, United States

The ultimate SNR (uSNR) and SAR (uSAR) have been computed in uniform spheres and cylinders. These ultimate metrics have been useful to rank coils with respect to the ultimate performance and to suggest design modifications. However the performance of parallel imaging and the computation of SAR are strongly affected by the geometry of the head and the non-uniform distributions of the conductivity and permittivity in vivo. We compute for the first time the uSNR and USAR in complex, non-uniform body models and use these metrics to assess the performance of receive (transmit) arrays with up to 128 (16) channels.

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