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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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