Abstract #2902

A Fast Parallel Excitation Pulse Design for Efficient Selection & Ordering of PE Locations with B0 Field Inhomogeneity

Daehyun Yoon¹, Jeffrey A. Fessler¹, Anna C. Gilbert², Douglas C. Noll³

¹Electrical Engineering, University of Michigan, Ann Arbor, MI, United States; ²Mathematics, University of Michigan, Ann Arbor, MI, United States; ³Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States

We present a novel method for selecting and ordering efficient phase encoding(PE) locations in an Echo-Volumar trajectory for parallel excitation considering B0 field inhomogeneity. Recently several parallel excitation algorithms were presented enforcing sparsity on the number of chosen PE locations, but none of them considered off-resonance during excitation. We observed from simulation that this could lead to significant degradation in excitation accuracy where strong off-resonance is present. We developed a fast greedy algorithm to select and order efficient PE locations considering B0 field inhomogeneity, and demonstrate from simulation that our algorithm can significantly improve the excitation accuracy.