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Abstract #0432

Split-Ring-Resonator shield improves SAR efficiency and homogeneity of birdcage antenna.

Carel Costijn van Leeuwen1, Stanislav B. Glybovski2, Peter R. Luijten1, Cornelis A.T. van den Berg1, and Alexander J.E. Raaijmakers1,3

1Center of Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands, 2ITMO University, St. Petersburg, Russian Federation, 3Biomedical Engineering, Eindhoven University of Technology, Eindhoven, Netherlands

A Split-Ring-Shield is a metamaterial structure that operates as a magnetic shield and thereby increases the penetration of the B1-field of a dipole antenna into a phantom. However, due to increased sample resistance it cannot be used effectively with a conventional birdcage. As a solution, a multi-transmit birdcage coil is presented, which can be used with the SRS. Simulations indicate a 10% increase in SAR-efficiency compared to a conventional birdcage. This setup was constructed and preliminary images were obtained.

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