Comprehensive analysis of parallel transmission local SAR errors introduced by an assumed uniform density distribution
Andre Kuehne 1,2 , Sigrun Goluch 1,2 , Ewald Moser 1,2 , and Elmar Laistler 1,2
Center for Medical Physics and Biomedical
Engineering, Medical University of Vienna, Vienna,
Center of Excellence, Medical University of Vienna,
Vienna, Vienna, Austria
In this work, the validity of the commonly made
assumption of an isotropic tissue density (1000 kg/m)
for SAR calculations is investigated. SAR matrix
Eigenvalues- and vectors of an 8-channel head array for
7T MRI are compared and a statistical analysis
performed. It is found, that the simplified SAR
distribution leads to an overestimation of local SAR by
11-12% on average.
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