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Abstract #2595

Fast Selection of Phase Encoding Locations in Parallel Excitation

Daehyun Yoon1, Ray Maleh2, Anna C. Gilbert2, Jeffrey A. Fessler1, Douglas C. Noll3

1Electrical Engineering, University of Michigan, Ann Arbor, MI, USA; 2Mathematics, University of Michigan, Ann Arbor, MI, USA; 3Biomedical engineering, University of Michigan, Ann Arbor, MI, USA

We propose a novel, fast method based on a hybrid version of Simultaneous Orthogonal Matching Pursuit(S-OMP) to select sparse phase-encoding locations in a Echo-Volumar(EV) trajectory for parallel excitation pulse design with slice-selective subpulses. Sparse phase-encoding selection was previously presented as a convex optimization problem in a Second Order Cone Program(SOCP) form, which was too slow to be computed on-line in parallel excitation. We present a much faster greedy algorithm, Parallel-OMP(P-OMP), which will solve the same problem in a few seconds with compatible accuracy to that of SOCP in both the single and multiple coil cases.