Abstract #1855
Local SAR Estimation via Electrical Properties Tomography: Physical Phantom Validations at 7T
Xiaotong Zhang 1 , Jiaen Liu 1 , Pierre-Francois Van de Moortele 2 , and Bin He 1,3
1
Department of Biomedical Engineering,
University of Minnesota, Minneapolis, Minnesota, United
States,
2
Center
for Magnetic Resonance Research, University of
Minnesota, Minneapolis, Minnesota, United States,
3
Institute
for Engineering in Medicine, University of Minnesota,
Minneapolis, Minnesota, United States
Electrical Properties Tomography technique, which
utilizes measurable B1 fields to reconstruct the local
electrical properties of biological tissues, can be used
to estimate local SAR on a subject-specific basis. The
purpose of the present work is to validate such B1-based
local SAR estimation by using previously proposed gEPT
algorithm. B1 measurement was obtained in phantoms
containing gelatin and biological tissues at 7T with a
multi-channel transmit/receive coil, and local SAR
distribution was predicted for a specific heating
protocol. SAR results were subsequently converted into
temperature changes which in turn were validated against
temperature changes measured by MRI Thermometry.
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