The Enhancement of Radio Frequency Magnetic Field for a 1.5 Tesla Magnetic Resonance System Using a High Impedance Surface

摘要

This paper presents a novel design of a High Impedance Surface (HIS) to improve theudmagnetic field strength of a Radio Frequency (RF) coil at 63.8 MHz, suitable for 1.5T magnetic resonanceudimaging (MRI) systems. The HIS is miniaturized using distributed interdigital capacitors.udA HIS with an electrically small unit cell (λ/94) and is positioned between a RF transmit-receiveud(TR) coil and an RF shield. The magnitude of the magnetic field from an RF coil when coupled to auddielectric phantom load (mimicking a biological sample) was estimated using numerical simulationud(finite integral methods) and corroborated with measurements. Simulated median improvementsudin magnetic field inside a dielectric phantom range from approximately 18% to 32% depending onudthe area of the HIS.