FIGURE 3.

The pulse sequence starts with the optimized excitation pulse, without a slice selection gradient, and contains 7 unpaired adiabatic refocusing pulses to generate 7 spin echoes and an optional eighth adiabatic pulse at the end of the sequence that returns the remaining z magnetization back to the +z‐direction. At each echo a pair of two identical cones were acquired in decreasing order with respect to cone angle. The fine structure of the first cone is not visible due to the plot linewidth. The sequence takes 165 ms