Abstract #1520

A Preclinical Volume Coil with Artificial Magnetic Shield for 7 Tesla MRI

Ksenia Lezhennikova¹, Anna Hurshkainen¹, Constantin Simovski², Alexander Raaijmakers³, Irina Melchakova¹, Redha Abdeddaim⁴, and Stanislav Glybovski¹

¹Faculty of Physics and Engineering, ITMO University, Saint-Petersburg, Russian Federation, ²Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland, ³Department of Radiotherapy, UMC Utrecht, Utrecht, Netherlands, ⁴Fresnel Institute, Aix-Marseille University, Marseille, France

In this work the artificial magnetic shield structure was proposed aimed to improve the performance of preclinical volume coil for 7 Tesla MRI. Particularly, transmit efficiency as well as receive sensitivity of small-animal bird-cage coil was studied in the presence of both ideal electric and magnetic screen at the first step. Next, practical artificial magnetic shield structure using the principles of operation of high-impedance corrugated surfaces was suggested. B₁⁺distribution of the small-animal bird-cage coil equipped with corrugated surface structure was calculated and compared with the reference case of ideal electric screen. Numerical results demonstrated improved transmit efficiency and receive sensitivity of the bird-cage coil with the artificial magnetic shield structure comparing to the reference case.

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