Abstract
Developments of metamaterials and related structure resonators have opened up new possibilities in designing materials and devices with unique properties. Here a metamaterial inspired wireless large - aperture hybrid resonator (LHR) comprising multiple metallic wires and dielectric is proposed to enhance the brain magnetic resonance imaging (MRI) at 1.5 T. The magnetic field, 10 g-averaged specific absorption rate (SARav.10g) and the signal-to-noise ratio (SNR) in the region of interest (ROI) for the realistic multi-tissue voxel human brain phantom without and with the presence of the LHR are compared. Due to the introduction of the proposed LHR, transmit efficiency is significantly enhanced by 2.60 times. The homogeneity of the magnetic field is as high as 94.4%. Moreover, the SNR in the ROI is enhanced by 1.90 times in the presence of LHR compared with using the head coil alone (the same inner diameter as the LHR). The SARav.10g is much lower than the safety limit. The proposed LHR has great potentiality to enhance the brain MRI effectively.
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