Key result
Joint design of excitation k-space trajectory and RF pulses improved target pattern excitation accuracy and reduced total integrated pulse power compared with conventional designs.
Joint design of trajectory and RF pulses improves excitation accuracy and reduces power in parallel MRI excitation compared to conventional predetermined trajectories.
May advance parallel transmit MRI techniques; leaves open in vivo validation before clinical adoption.
We propose an alternating optimization framework for the joint design of excitation k-space trajectory and RF pulses for small-tip-angle parallel excitation. Using Bloch simulations, we show that compared with conventional designs with predetermined trajectories, joint designs can often excite target patterns with improved accuracy and reduced total integrated pulse power, particularly at high reduction factors. These benefits come at a modest increase in computational time.
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Yip et al. (2007) studied this question. Joint design of excitation k-space trajectory and RF pulses vs. Conventional designs with predetermined trajectories was evaluated on Target pattern excitation accuracy and total integrated pulse power. Joint design of excitation k-space trajectory and RF pulses improved target pattern excitation accuracy and reduced total integrated pulse power compared with conventional designs.
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