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. Raaijmakers^1,3

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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