Title :
Four-leaf-clover-shaped EBG structure to improve the H/E field ratio of stripline coil for 7 Tesla MRI
Author :
Saleh, G. ; Solbach, Klaus ; Erni, Daniel ; Rennings, Andreas
Author_Institution :
High-Freq. Tech. (HFT), Univ. of Duisburg-Essen, Duisburg, Germany
Abstract :
This paper presents a multilayer four-leaf-clover-shaped EBG structure as a high impedance surface behind a 7 Tesla MRI stripline coil (meander dipole), operating at 300MHz. The proposed EBG structure has been characterized by its in-phase band gap reflection coefficient, and the surface wave suppression band gap properties. The electrical cell size of the analyzed EBG structure has been reduced to 6.8% of free-space wavelength. The MRI stripline coil backed by the proposed EBG structure exhibited stronger (by 57%) magnetic over electric field ratio than the original design using a PEC ground plane for the coil. The longitudinal RF field of view (FOV) has been maximized when the strip-line coil length is increased from 25cm to 35cm.
Keywords :
coils; magnetic resonance imaging; photonic band gap; strip lines; H-E field ratio; MRI stripline coil; PEC ground plane; analyzed EBG structure; electrical cell size; free-space wavelength; high-impedance surface; in-phase band gap reflection coefficient; longitudinal RF field-of-view; magnetic-electric field ratio; meander dipole; multilayer four-leaf-clover-shaped EBG structure; strip-line coil length; surface wave suppression band gap properties; Coils; Electric fields; Magnetic resonance imaging; Metamaterials; Photonic band gap; Surface waves; electromagnetic band gap (EBG) structures; in-phase reflection band; magnetic resonance imaging (MRI); specific absorption rate (SAR); surface wave suppression band gap;
Conference_Titel :
Antennas and Propagation (EuCAP), 2013 7th European Conference on
Conference_Location :
Gothenburg
Print_ISBN :
978-1-4673-2187-7
Electronic_ISBN :
978-88-907018-1-8
