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Abstract #2340

Intravoxel B0 Corrected Image Reconstruction with RF Prephasing

Steven T. Whitaker1, Jon-Fredrik Nielsen2, and Jeffrey A. Fessler1
1Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, United States, 2Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States


Regions with large intravoxel B0 gradients result in a wide spread of off-resonance frequencies within each voxel, causing spins within a voxel to dephase with respect to each other. Using model-based reconstruction to account for this dephasing can help alleviate artifacts from this signal loss, but success is limited in areas of extreme dephasing. We propose a model-based reconstruction method that includes RF prephasing to help mitigate the effects of extreme dephasing. We demonstrate that the proposed approach successfully recovers signal in areas of extreme dephasing and results in lower reconstruction error than model-based reconstruction without RF prephasing.

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