Keywords: Parallel Transmit & Multiband, High-Field MRI
Motivation: Dipole RF elements with electronically switchable B1 field patterns have been shown to improve receive performance. The question whether they are beneficial for transmission is still open.
Goal(s): Improve flip angle homogeneity by modulating the Tx sensitivity of a dipole during excitation.
Approach: An RF coil built from eight dipoles with electronically switchable sensitivities was constructed. Achievable flip angle homogeneity with 2-kT-points pulses was evaluated in simulations and in experiments.
Results: Flip angle homogeneity could be increased by electronically switching the Tx sensitivity during the course of the RF pulse.
Impact: RF elements with switchable transmit sensitivities offer a novel degree of freedom for excitation that promises improved flip angle homogeneity. This addresses one of the most pressing problems in ultra-high field MRI.
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