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Abstract #4705

Coil Sensitivity Specific Optimization of Wave Encoding Gradient Trajectory for High Acceleration and Low Slew Rate

Shi Su1,2, Zheyuan Yi1,2, Yujiao Zhao1,2, Linfang Xiao1,2, Ziming Huang1,2, Jiahao Hu1,2, Junhao Zhang1,2, Vick Lau1,2, Christopher Man1,2, Alex T.L. Leong1,2, and Ed X. Wu1,2
1Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, China, 2Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China


Wave encoding offers high acceleration in parallel imaging by exploring the coil sensitivity variations in the readout dimension. However, typically preset wave gradients (i.e., sinusoidal trajectory) have never been optimized for specific receiver array coil, thus intrinsically limiting the maximum acceleration factor. We propose to optimize the gradient trajectory in a coil sensitivity specific manner by minimizing the squared L2-norm of off-diagonal elements in encoding correlation matrix. To guarantee an allowed maximum gradient slew rate, a bandlimited constraint is also introduced in optimization. This procedure leads to significant improvements in g-factor map and artifact reduction, especially at very high acceleration.

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