Saleh, Gameel; Solbach, Klaus; Rennings, Andreas:
EBG structures to improve the B1 efficiency of stripline coil for 7 Tesla MRI
In: Proceedings of the 6th European Conference on Antennas and Propagation : EuCAP 2012 : Prague, 26-30 March 2012 - Piscataway, NJ: IEEE, 2012, S. 1399 - 1401
Buchaufsatz/Kapitel in Sammelwerk2012Elektrotechnik
Fakultät für Ingenieurwissenschaften » Elektrotechnik und Informationstechnik » Hochfrequenztechnik
Titel:
EBG structures to improve the B1 efficiency of stripline coil for 7 Tesla MRI
Autor(in):
Saleh, GameelLSF; Solbach, KlausLSF; Rennings, AndreasLSF
Erscheinungsjahr
2012
DOI:

Abstract:

This paper presents the first application of an EBG structure to improve the B1 efficiency of strip-line coils used for 7-Tesla Magnetic Resonance Imaging (MRI). The proposed offset multilayer electromagnetic band gap (EBG) structure is utilized as a high impedance surface behind an extended half-wavelength (meandered) dipole. It operates at 300MHz, the magnetic resonance frequency at 7 T, and comprises of electrically small cells of only 7.5% of the free-space wavelength. The reflection phase coefficient and the dispersion diagram were used to characterize the EBG structure. The MRI strip-line coil backed by our EBG structure is successful in exhibiting a stronger B1- field inside a phantom than the original design using a metallic conductor (PEC) ground plane for the coil. The quantitative improvement in B1 efficiency amounts to 47%.