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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