Homogeneous B₁ ⁺ for bilateral breast imaging at 7 T using a five dipole transmit array merged with a high density receive loop array.

ABSTRACT: To explore the use of five meandering dipole antennas in a multi-transmit setup, combined with a high density receive array for breast imaging at 7 T for improved penetration depth and more homogeneous B₁ field. Five meandering dipole antennas and 30 receiver loops were positioned on two cups around the breasts. Finite difference time domain simulations were performed to evaluate RF safety limits of the transmit setup. Scattering parameters of the transmit setup and coupling between the antennas and the detuned loops were measured. In vivo parallel imaging performance was investigated for various acceleration factors. After RF shimming, a B₁ map, a T₁ -weighted image, and a T₂ -weighted image were acquired to assess B₁ efficiency, unif

SUBMITTER: Krikken E 

PROVIDER: S-EPMC6587506 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature