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Abstract #0779

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

Bahadir Alp Barlas1,2, Cagla Deniz Bahadir1,2,3, Sevgi Gokce Kafali1,2,4, Ugur Yilmaz2, and Emine Ulku Saritas1,2,5
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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