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Abstract #0768

Design and demonstration of an artificial dielectric for 7 T MRI

Vsevolod Vorobyev1, Alena Shchelokova1, Irena Zivkovic2, Alexey Slobozhanyuk1, Juan Domingo Baena3, Juan Pablo del Risco4, Redha Abdeddaim5, Andrew Webb2,6, and Stanislav Glybovski1
1Department of Nanophotonics and Metamaterials, ITMO University, Saint Petersburg, Russian Federation, 2Department of Radiology, C.J.Gorter Center for High Field MRI, Leiden University Medical Center, Leiden, Netherlands, 3Department of Physics, Universidad Nacional de Colombia, Bogota, Colombia, 4School of Exact Sciences and Engineering, Universidad Sergio Arboleda, Bogota, Colombia, 5Aix Marseille University, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France, 6Stevens Research Center, Carle Foundation Hospital, Urbana, IL, United States

We present a new approach replacing high-permittivity water-based dielectric pads with a non-resonant low-cost artificial dielectric to improve MR image quality by modifying the interferences present in the radiofrequency field at 7T MRI. The artificial dielectric comprises a stack of metal patches printed on dielectric substrates. Numerical studies and imaging of a head-phantom with the proposed structure showed the same increase in the transmit radiofrequency field distribution at the area of interest as for conventional dielectric pads. The advantages of the new structure include ease of manufacture and long-term stability.

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