A self-matched leaky-wave antenna for ultrahigh-field magnetic resonance imaging with low specific absorption rate.

ABSTRACT: The technology of magnetic resonance imaging is developing towards higher magnetic fields to improve resolution and contrast. However, whole-body imaging at 7 T or even higher flux densities remains challenging due to wave interference, tissue inhomogeneities, and high RF power deposition. Nowadays, proper RF excitation of a human body in prostate and cardiac MRI is only possible to achieve by using phased arrays of antennas attached to the body (so-called surface coils). Due to safety concerns, the design of such coils aims at minimization of the local specific absorption rate (SAR), keeping the highest possible RF signal in the region of interest. Most previously demonstrated approaches were based on resonant structures such as e.g. dipoles, capacitively-loaded loops, TEM-line sections.

SUBMITTER: Solomakha G 

PROVIDER: S-EPMC7815766 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature