Abstract #0916

B1+ inhomogeneity mitigation using adiabatic refocusing RF pulses for diffusion weighted imaging at 7T

Shahrokh Abbasi-Rad¹, Martijn Cloos^1,2, Jin Jin³, Kieran O'Brien³, and Markus Barth^1,2,4

¹Centre for Advanced Imaging, University of Queensland, Brisbane, Australia, ²ARC Training Centre for Innovation in Biomedical Imaging Technology, The University of Queensland, Brisbane, Australia, ³Siemens Healthcare Pty Ltd, Brisbane, Australia, ⁴School of Electrical Engineering and Information Technology, The University of Queensland, Brisbane, Australia

Ultra-high field scanners offer a potential signal-to-noise ratio (SNR) improvement for Diffusion weighted Imaging (DWI). However, the application of DWI at 7T is hindered by several technical challenges. In particular, B1+ inhomogeneity can lead to signal dropouts that degrades image quality in the temporal lobes and base of the skull. In this work, we show that embedding time-resampled frequency offset corrected inversion pulses (TR-FOCI) in a twice-refocussed spin echo DWI sequence can recover the signal in these brain areas.

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