Toward a 16-channel loop-dipole combined dielectric resonator antenna array for human brain MRI at 7T using pTX

Motivation: To develop a new generation of head coils for ultrahigh field MRI using loop-dipole combined dielectric resonator antenna arrays. Goal(s): To construct and evaluate an 8-channel loop-coupled dielectric resonator antenna array for brain MRI at 7T. Approach: Electromagnetic field simulations in a spherical phantom and Duke for different types of RF feeds were performed. An 8-channel, loop-coupled dielectric resonator antenna array was constructed using 8 ceramic, rectangular dielectric blocks (εr=275, σ=0.068 S/m). Results: An 8-channel loop-coupled dielectric resonator antenna array was successfully constructed and evaluated at the bench as well as in preliminary phantom experiments at 7T using pTX system. Impact: This study is an important step to improve transmit and receive performance of head coils for neuroimaging at 7T.