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Abstract #0916

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

Shahrokh Abbasi-Rad1, Martijn Cloos1,2, Jin Jin3, Kieran O'Brien3, and Markus Barth1,2,4
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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