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Abstract #0548

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

1 Dept of Electrical Engineering & Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 2 A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States, 3 Harvard-MIT Division of Health Sciences Technology, Cambridge, MA, United States

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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