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Abstract #2161

Tunable Defected Ground Structure for Decoupling Monopole Antenna Transmit/Receive Arrays in 7T MRI

Xinqiang Yan1,2 and William A. Grissom1,2,3

1Institute of Imaging Science, Vanderbilt University, Nashville, TN, United States, 2Radiology, Vanderbilt University, Nashville, TN, United States, 3Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

Radiative dipole and monopole coil arrays are increasingly used for ultrahigh field MRI, but few decoupling methods have been proposed for radiative arrays. To overcome this problem, we propose a Tunable-Defected-Ground-Structure (TDGS) method to decouple monopole arrays at 7T. This concept was successfully validated by EM simulation, bench test and MR experiments. By using the TDGS method, the cross-talk between two closely-spaced monopoles was reduced from -7 dB to -25 dB. It was also found that the TDGS method had little effect on the original B1 fields of the individual monopole elements.

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