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Abstract #4275

Experimental and numerical evaluations of simultaneously excitable Eigenmodes in a 20-channel transmit RF array for 7 Tesla human MRI

Tales Santini1, Yujuan Zhao1, Sossena Wood1, Junghwan Kim1, Nadim Farhat1, Narayanan Krishnamurthy1, Tiejun Zhao2, and Tamer S. Ibrahim1

1University of Pittsburgh, Pittsburgh, PA, United States, 2Siemens Medical Solutions, Tarrytown, NY, United States

The Eigenmodes of a 20-channel Tic-Tac-Toe RF array are presented and analyzed. The Eigenmodes were calculated for each excitation level in Z (static magnetic field) direction, resulting in 4 modes per level and 20 in total. FDTD simulations and in-vivo experiments were performed. Quadrature mode is the most efficient, and generally excites the center of the brain; Anti-quadrature mode excites the head periphery; and the Zero-phase mode excites the cerebellum. Up to 5 modes can be excited simultaneously which can potentially result in a homogenous B1+ pattern and low levels of Average/peak SAR.

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