Hilbert Fractal Inspired Dipoles for B₁⁺Field Control in Ultra-High Field MRI

Abstract

Due to the reduction of wavelengths inside the human tissues at ultra-high field magnetic resonance imaging (MRI), head coils usually present B 1 + magnetic field inhomogeneities located at the temporal lobes of the brain. This problem has been effectively targeted by different approaches, with the downside that they can either decrease the B 1 + field in other important areas or be uncomfortable to the patient. Here, we present a new approach based on Hilbert fractal inspired dipoles. Our structures are able to improve simultaneously the B 1 + field in each temporal lobe without diminishing the patients' comfort or the B 1 + field in other parts of the brain.