Design considerations for dipole for head MRI at 10.5T

As the world´s first 10.5T whole body human MRI scanner is ready for discoveries on new research frontiers, RF challenges need to be overcome to fully realize the benefits of the ultra-high MRI system. Dipole antennas were investigated with the Finite-Difference Time-Domain (FDTD) method. For best head MRI at 10.5T, results showed that dipole arrays should be long and conformal to the head geometry. A bottom ring connecting all dipole elements with adjustable capacitance can be helpful in improving RF homogeneity. RF and dielectric shielding, and dielectric pads around head may result in a dramatic rise of the Specific Absorption Rate (SAR) within head tissues.