Open AccessEnhancement of radio frequency magnetic field for a 1.5 T magnetic resonance system using a high impedance surface
Author(s) -
Issa Ismail,
Ford Kenneth Lee,
Rao Madhwesha,
Wild James
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2016.0088
Subject(s) - imaging phantom , radio frequency , electromagnetic coil , magnetic field , materials science , electrical impedance , dielectric , nuclear magnetic resonance , capacitor , radiofrequency coil , acoustics , optoelectronics , optics , electrical engineering , physics , engineering , voltage , quantum mechanics
This study presents a novel design of a high impedance surface (HIS) to improve the magnetic field strength of a radio frequency (RF) coil at 63.8 MHz, suitable for 1.5 T magnetic resonance imaging systems. The HIS is miniaturised using distributed interdigital capacitors. A HIS with an electrically small unit cell ( λ /94) and is positioned between a RF transmit‐receive coil and an RF shield. The magnitude of the magnetic field from an RF coil when coupled to a dielectric phantom load (mimicking a biological sample) was estimated using numerical simulation (finite integral methods) and corroborated with measurements. Simulated median improvements in magnetic field inside a dielectric phantom range from approximately 18 to 32% depending on the area of the HIS.