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 Webb^2,6, 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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