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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