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
Radiology, Bioengineering, Electrical
Engineering, Stanford University, Stanford, CA, United
Stanford University, Stanford, CA, United States,
Leiden University Medical Center, Leiden, Netherlands,
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
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