Abstract #4901
The Effect of Brain Tumors on Local SAR Levels at 7T
Matthew C. Restivo 1 , Cornelis A.T. van den Berg 1 , Astrid L.H.M.W. van Lier 1 , Danil L. Polders 1 , Alexander J.E. Raaijmaker 1 , Peter R. Luijten 1 , and Hans Hoogduin 1
1
Imaging Division, University Medical Center
Utrecht, Utrecht, Netherlands
It is well known that specific absorption rate (SAR) is
highly dependent on tissue conductivity. Previous work
has shown that brain tumors have increased conductivity
compared to surrounding tissues. In this work, we
analyzed the effects of brain tumors on simulated local
SAR levels at 7T. We segmented dielectric tissues from
T1w scans of three actual tumor patients. We then
assigned realistic conductivity values that were known
from 7T Electrical Property Tomography of the same
patients. We are able to show that the presence of
tumors increases SAR locally, although not to the extent
that we predict.
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