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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