Figure 2:

The proposed VSI pulse is designed using a Fourier Transform based Velocity-Selective labeling pulse train to reduce spurious labeling of moving myocardium and achieve better labeling efficiency. This pulse is ~2x the duration of the original VS pulse and larger signal loss due to relaxation. 9 sub-pulses (blue) achieve velocity-selective inversion. Hard refocusing pulses (green) utilize MLEV phase cycling to reduce sensitivity to off-resonance. Bipolar gradients (red) between paired refocusing pulses achieve velocity encoding while removing potential for VS-stripe artifact. A 0.25 ms delay follows each gradient pair to reduce sensitivity to eddy currents.