Comparison of Dipole and Sleeve antenna arrays for Optimized Human Head Imaging at 10.5 Tesla

Motivation: To optimize B1+ and SAR efficiency for human head imaging at 10.5 T with 8 and 16-ch. dipole and sleeve antenna arrays. Goal(s): Evaluation of achievable transmit performance among multiple dipole and sleeve antenna arrays. Approach: Simulated and experimental analysis of B1+ and SAR efficiency comparing dipole and sleeve antennas with the same number of elements. Results: The sleeve antenna arrays exhibited slightly improved SAR efficiency compared to the dipole antenna arrays. Simulation and experimental data including the coaxial feed-cables indicated that the sleeve antenna arrays exhibited a 23.8%(8-channel) and 11.3%(16-channel) higher SAR efficiency than the dipole antenna array with coaxial cables. Impact: Our simulations and experiments comparing sleeve and dipole antenna arrays indicate that the antenna validation is notable affected by the presence of coaxial feed cables and that those need to be included for accurate results.