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Abstract #0754

Experimental Characterization of Artificial Magnetic Shield for Improvement of Small-Animal Birdcage at 7 T

Ksenia Lezhennikova1, Redha Abdeddaim2, Anna Hurshkainen1, Alexandre Vignaud3, Marc Dubois2,4, Konstantin Simovski5, Alexander Raaijmakers6, Irina Melchakova1, Stefan Enoch2, Pavel Belov1, and Stanislav Glybovski1
1Faculty of Physics and Engineering, ITMO University, St.Petersburg, Russian Federation, 2CNRS, Centrale Marseille, Institut Fresnel, Aix Marseille Univ, Marseille, France, 3CEA-Saclay, DRF/I2BM/Neurospin/UNIR, Université Paris-Saclay, Gif-sur-Yvette Cedex, Paris, France, 4CNRS, CRMBM, Aix Marseille Univ, Marseille, France, 5Department of Electronics and Nanoengineerin, AALTO University, AALTO, Finland, 6Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

We proposed a practical realization of an artificial shield for a small-animal birdcage coil for 7T MRI based on a cylindrical miniaturized corrugated structure, which demonstrates the property of a constructive interference inside the coil. The presence of a conventional metallic shield around the birdcage significantly limits the coil efficiency because of the destructive interference between the magnetic field of the shield and the primary field of the coil in the subject. We numerically and experimentally demonstrated that the proposed structure placed around the birdcage could increase the efficiency for relatively small samples due to its in-phase reflection.

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