Abstract #0697

B0 and B1 Insensitive Robust Fat Suppression using Frequency Offset Corrected Inversion (FOCI)

Xinzeng Wang¹, Joshua S. Greer^1,2, Ivan E. Dimitrov^3,4, and Ananth J. Madhuranthakam^1,3

¹Radiology, UT Southwestern Medical Center, Dallas, TX, United States, ²Bioengineering, University of Texas at Dallas, Richardson, TX, United States, ³Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, TX, United States, ⁴Philips Medical Systems, Cleveland, OH, United States

STIR uses adiabatic non-selective hyperbolic secant (HS) inversion pulse to achieve uniform fat suppression even in the presence of B1 inhomogeneities. However, in the regions of increased B0 and B1 inhomogeneities, particularly at 3T and higher field strengths, the increased bandwidth of the HS pulse comes at the expense of higher adiabatic threshold. In this work, we evaluated C-FOCI pulse to achieve robust fat suppression with broader bandwidth and increased robustness to B1 variations compared to HS pulse. We also derived an analytical expression for the adiabatic threshold of C-FOCI pulse and show robust performance against B0 and B1 inhomogeneities.

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