Simple Quadrature Volume Antenna Transformed from Loop

Hideta Habara¹, Yoshitaka Bito¹, Hisaaki Ochi¹, Yoshihisa Soutome¹, Yukio Kaneko¹, Masayoshi Dohata^1,2, Hiroyuki Takeuchi², Tetsuhiko Takahashi²

Quadrature-driven cylindrical volume antennas, such as birdcage or TEM antennas, are indispensable hardware for commercial MRI scanners. However, they consist of many parts, making them complex to build. We introduce a simple quadrature volume antenna having only five parts by transforming a one-loop antenna. If a loop on a cylindrical surface is folded 2N times and the number of current nodes in the loop is 2(N-1), a uniform B1+ field is created in the center of the cylinder. A prototype of a 3T head antenna was made, and a phantom image was obtained.