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. Author manuscript; available in PMC: 2017 Oct 1.
Published in final edited form as: Magn Reson Med. 2015 Oct 28;76(4):1136–1148. doi: 10.1002/mrm.26010

Figure 1.

Figure 1

(a) Diagram of the FT-VSI pulse train with paired and phase-cycled refocusing pulses in each velocity encoding step, gradients with alternating polarity surrounding refocusing pulses for velocity-sensitized waveform (red solid lines) and uni-polar gradients for velocity-compensated waveform (red dashed lines for the polarity-switched gradient lobes). (b) The simulated Mz-Velocity responses of the pulse (a) with different T2 relaxation effects: 1500 ms (CSF), 150 ms (arterial blood), and 70 ms (tissue). The vertical dashed lines indicate the inversion band (±4 cm/s). The horizontal dashed lines illustrate the universal inversion response of the FT-VSI pulse train for the control scan. (c) The simulated Mz-velocity responses of the labeling pulse (a) at different B0 conditions with representative B1+ scales of 0.8, 1.0, and 1.2.