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Abstract #2331

RF Shimming in an MRgFUS Brain Transducer with a High Permittivity Material

Kim Butts Pauly 1 , Ron Watkins 2 , Rachelle Bitton 2 , Wyger Brink 3 , Andrew Webb 3 , Beat Werner 4 , and Pejman Ghanouni 2

1 Radiology, Bioengineering, Electrical Engineering, Stanford University, Stanford, CA, United States, 2 Radiology, Stanford University, Stanford, CA, United States, 3 Radiology, Leiden University Medical Center, Leiden, Netherlands, 4 University Childrens Hospital Zurich, Zurich, Switzerland

During MRgFUS neurosurgery at 3T, dielectric resonances occur in the integrated water bath that is required for coupling and to cool the scalp. These resonances result in heterogeneous MR signal intensity across the brain. Here, we investigate RF shimming with a high permittivity material to mitigate this effect. Simulations and experiments for pads of barium titanate, placed outside but in contact with the water bath, show that the pads improve the homogeneity of the B1+ field significantly.

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