Design of a Robust Decoupling Matrix for High Field Parallel Transmit Arrays
Zohaib Mahmood 1 , Bastien Gurin 2 , Boris Keil 2 , Elfar Adalsteinsson 1,3 , Lawrence L. Wald 2,3 , and Luca Daniel 1
Dept of Electrical Engineering & Computer
Science, Massachusetts Institute of Technology,
Cambridge, MA, United States,
A. Martinos Center for Biomedical Imaging, Dept. of
Radiology, Massachusetts General Hospital, Charlestown,
MA, United States,
Division of Health Sciences Technology, Cambridge, MA,
We present a methodology to design a robust decoupling
matrix for high field parallel transmit arrays. The
matrix is placed between the power amplifiers and the
coupled coil and yields almost perfect decoupling of the
array and hence improves the power efficiency. We
demonstrate the methodology by designing a decoupling
matrix for a coupled 7T 4-channel head transmit-array.
Our design is robust with respect to component value
variations. A sensitivity analysis revealed that only
two lumped elements need to be implemented as variable
in order to guarantee good performance of the matrix
even in the presence of component values variations.
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