James B. Murdoch1
1Toshiba Medical Research Institute USA, Mayfield Village, OH, United States
High-bandwidth slice-selective refocusing pulses are important for proton spectroscopy at 3T and above, but they are not easy to construct. Previously it has been proposed to combine a self-refocused 90 excitation pulse with a time-reversed version of itself to create a suitably spin-flipping 180 waveform. However, the 90 pulse need not be wholly slice-selective: MX and MZ can vary outside the desired slice width so long as MY≈0. Both AM and PM excitation pulses have therefore been optimized for the proper MY response and then combined to spawn new refocusing pulses (with a PM second-component phase flip for overall antisymmetry).