Periodic passive components (PPC) such as metamaterials can improve SAR efficiency and B1 penetration. However, due to the shorter RF wavelength in MRI, the performance of PPC is confined by the limited number of unit cells. In this work, a novel PPC structure has been proposed to combine with a high permittivity pad (HPP), so a larger number of unit cells can be used. The designed structure is excited by a dipole coil and compared with the case when a single HPP is used. It is observed that more than 50% SAR reduction can be achieved.
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