A seminar by Daniel ERNI, Professor for General and Theoretical Electrical Engineering at the University of Duisburg-Essen, Germany
Salle de réunion du CEMEREM, Campus Timone, Marseille | Tuesday, January 16 at 14h00
In a brief overview, he'd like to address our various research activities at the University of Duiburg-Essen that are devoted to the enhancement and the molding of RF magnetic fields within ultra-high field MRI scanners at 7T. This includes the development of coil elements (at 298MHz) based on composite right-/left-handed (CRLH) 1D electromagnetic (EM) metamaterial transmission lines (i.e. EM metalines) operating in the zeroth order resonance (ZOR) to foster uniform RF magnetic field distributions along the scanner axis. Tailored EM metalines supporting quarter-wave or full-wave resonances are used either as dual-band coil elements for simultaneous 1H/23Na imaging or as metamaterial ring antenna. The latter is key to the MetaBore, which is a fully adaptive RF field control scheme based on a periodic axial arrangement of conformal metamaterial ring antennas in the framework of high-field traveling-wave MRI. With the 2D EM metamaterials (metasurfaces) we realized hard, soft and high-impedance surfaces (HIS) in order to enhance the uniformity and directivity of the RF magnetic field from e.g. overlaying (elongated) dipole elements (respective series resonant loops) towards the probe volume. Some designs may include simulation studies of the overall multichannel coil systems, which are carried out with our home-made, freely available and open electromagnetic 3D EC-FDTD solver openEMS.
For the experimental verification of our coils we rely on close collaborations with the Erwin L. Hahn Institute for Magnetic Resonance Imaging (ELH) of our university's hospital in Essen as well as with the Institute for Biometrics and Medical Informatics at the Otto-von-Guericke University in Magdeburg, both equipped with a 7T MRI scanner (Siemens Magnetom).
Monique BERNARD, Director CRMBM - UMR 7339, CNRS-Aix-Marseille Université, Faculté de Médecine Timone, Marseille, France
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Stefan ENOCH, Director Institut Fresnel - UMR7249, CNRS-Aix-Marseille Université-ECM, Faculté des Sciences St Jérôme, Marseille, France
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