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Abstract #4595

Metasurface for passive RF shimming to improve brain imaging at 7T

Vladislav Koloskov1, Alena Shchelokova1, and Andrew Webb2
1School of Physics and Engineering, ITMO University, St. Petersburg, Russian Federation, 2Department of Radiology, C.J. Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands

Synopsis

Keywords: Hybrid & Novel Systems Technology, Hybrid & Novel Systems Technology, metasurface, passive shimmingWe propose a new passive radiofrequency (RF) shimming approach using a flexible, compact, low-cost, and long-term stability metasurface to improve brain imaging at 7T. The metasurface can be manufactured as a periodic structure based on a set of metal crosses connected by the capacitors, thus having a thickness of less than 1 mm. Numerical studies with the human voxel model showed up to 6% homogeneity improvement at the regions of interest (ROI) in the presence of the metasurface in comparison with the conventional case, which also outperforms the effect of the dielectric pad’s placement.

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Keywords