The promise of supra-linear boost in signal-to-noise-ratio is driving the development of MRI at extremely high static field strengths, such as 10.5T and beyond. The shorter wavelengths in tissues at high Larmor frequency causes destructive interference of the electromagnetic field, resulting in image inhomogeneity and increased local specific absorption rate (SAR). An efficient transmit array is vital in this regime to optimally use the available RF power, achieve efficient excitation and operate within SAR constraints. This work presents the design and optimization of an 8-channel transmit array for MRI at 11.7T and its performance evaluation using RF pulse design simulations.
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