Keywords: RF Pulse Design & Fields, High-Field MRI
Motivation: In ultra-high field MRI, transmit magnetic field (B1+) inhomogeneities are affecting kidney imaging.
Goal(s): Our goal was evaluate dynamic kT-point pulses for homogenous excitation in bilateral renal imaging.
Approach: Channel-wise B1+ maps of the kidneys were acquired for 15 subjects. Universal and individual kT-point pulses with different number of subpulses were calculated and evaluated. For one subject anatomical images were acquired with phase shims and dynamic kT-point pulses.
Results: While fixed-phase shims still suffer from flip-angle inhomogeneity, universal and subject-specific dynamic pulses with non-selective 5kT-point trajectories improves flip-angle homogeneity in the kidney and enable imaging with homogeneous excitation.
Impact: Our study evaluated universal and subject-specific kT-point pulses for kidney MRI at 7T. kT-point pulses substantially improve flip-angle homogeneity and universal pulses enable calibration-free imaging at ultra-high field, promising advances in high-resolution renal imaging.
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