A high impedance surface for improving the radio frequency magnetic field for a 1.5 Tesla Magnetic Resonance system

Abstract

This paper focuses on the application of a High Impedance Surface (HIS) to enhance the RF magnetic field (Hi) for a 1.5 Tesla Magnetic Resonance Imaging (MRI) system. The proposed structure is based on a miniaturized HIS using an interdigital capacitance approach. The surface utilizes a HIS between the Radio Frequency (RF) transmit coil and the MRI scanners RF shield which operates at 63.8MHz. The proposed system shows a higher Hi-field inside a homogeneous phantom as compared to a coil above an RF shield. By using this approach, the magnitude of Hi-field was improved by 40%.