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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