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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