Abstract #0779

Off-resonance Robustness in Reduced FOV Imaging using Sheared 2DRF Excitation

Bahadir Alp Barlas^1,2, Cagla Deniz Bahadir^1,2,3, Sevgi Gokce Kafali^1,2,4, Ugur Yilmaz², and Emine Ulku Saritas^1,2,5

¹Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, ²National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey, ³Department of Biomedical Engineering, Cornell University, New York, NY, United States, ⁴Department of Bioengineering, University of California Los Angeles, Los Angeles, CA, United States, ⁵Neuroscience Graduate Program, Bilkent University, Ankara, Turkey

The use of 2D echo-planar radiofrequency (2DRF) excitation has been widely applied in reduced field-of-view imaging of targeted regions, especially for diffusion weighted imaging (DWI). This work proposes effective and efficient coverage of the excitation k-space by shearing the 2DRF trajectory. This approach enables significant improvement in off-resonance robustness of 2DRF pulses by minimizing the pulse duration. It also promises improved clinical utility by increasing SNR in problem regions, eliminating slice coverage limitations and providing inherent fat suppression capability.

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