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Abstract #4930

Effects of the load size on the maximum local SAR at 7T

Gianluigi Tiberi 1 , Nunzia Fontana 2 , Riccardo Stara 3 , Mark Roger Symms 4 , Agostino Monorchio 2 , Mauro Costagli 1 , Laura Biagi 5 , Mirco Cosottini 6 , and Michela Tosetti 5

1 Imago7, Pisa, PI, Italy, 2 Dipartimento di Ingegneria dellInformazione, Pisa, Italy, 3 Dipartimento di Fisica, Pisa, Italy, 4 General Electric ASL Scientist (EMEA), Pisa, Italy, 5 IRCCS Stella Maris, Pisa, Italy, 6 Dipartimento di Neuroscienze, Pisa, Italy

In this study we investigated the effects of the load size on the maximum local SAR at 7T. Specifically, we resorted to: i) 3D full wave numerical electromagnetic simulations for analyzing a surface loop loaded with anatomic human calves models; ii) 2D analytical approach for analyzing a volume resonator loaded with homogeneous cylindrical phantoms having average tissue dielectric properties. In both cases we noticed that the maximum local SAR decreases with decreasing load size: this holds true if the RF magnetic fields (B1+) for the different load sizes are scaled so to achieve the same slice average value of 1T.

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