Geometry optimization of 7T dual-row transmit arrays

We investigated how trade-off between B1+ averaged over the volume of interest, BV_sar= B1+V /SAR10g, the safety excitation efficiency, and IB1+V (B1+ root-mean-square inhomogeneity) depends on overlapped dual-row transmit array geometry, position of a head inside the array and array tuning condition. Different tuning conditions resulted in larger peak-to-peak variation for CP excitation than for excitations that minimized IB1+V. For these excitations IB1+V decreased from 15% to 12% when brain was located in middle of the coil. This position is clearly preferable for keeping the safety excitation efficiency unaffected. For an overlapping dual row array with four elements in each row designed for full-brain coverage, a small overlap is preferable.

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