The Coax Dipole: A fully flexible coaxial cable dipole antenna with flattened current distribution for body imaging at 7 Tesla.

ABSTRACT:

Purpose

The coax dipole antenna, a flexible antenna for body imaging at 7T is presented. Similar to the high impedance coil, this coaxial cable antenna is fed on the central conductor and through gaps in the shield, the current passes to the outside of the antenna to generate B₁ field. This could achieve more favorable current distributions and better adaptation to the body curvature.

Methods

Finite difference time domain (FDTD) simulations are performed to optimize the positions of the gaps in the shield for a flat current profile. Lumped inductors are added to each end to reduce losses. The performance of a single antenna is compared to a fractionated dipole using B₁ maps and MR thermometry. Finally, an array of eight coax dipoles is evaluated in simu

SUBMITTER: van Leeuwen CC 

PROVIDER: S-EPMC9292881 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature