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Abstract #4900

B1+-based SAR assessment using a birdcage coil at 7 Tesla: experimental evaluation using magnetic resonance thermometry

Nicolas Boulant 1 , Ulrich Katscher 2 , Michel Luong 1 , Aurelien Massire 1 , Alexis Amadon 1 , and Alexandre Vignaud 1

1 Neurospin, CEA, Saclay, Ile de France, France, 2 Philips Research Europe, Hamburg, Germany

The emerging field of Electric Properties Tomography has shown great promise to provide patient-specific information about the electric field via the post-processing of measured B1+ data utilizing Maxwells equations. The work of Voigt et al furthermore showed a good correlation between the numerically determined SAR distribution and the one based on the post-processing of the B1+ field at up to 3T, but with a global offset between the two. The purpose of this work was to experimentally evaluate this B1+-based SAR determination via MR temperature-based measurements at 7T with a birdcage coil on a phantom of known electrical properties.

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