Whole-Brain Diffusion MRI at 7T With Universal Multiband GRAPE pTx Pulses.
PURPOSE To improve signal strength and homogeneity of whole-brain diffusion-weighted imaging (DWI) at 7T. METHODS Universal multiband excitation and refocusing pulses were optimized with the gradient ascent pulse engineering (GRAPE) algorithm across a database of B 1 + and B 0 maps obtained from 20 subjects. Slice-se...