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Sensitivity of the proposed VS saturation sequence to B1+ variation. Longitudinal magnetization in the velocity stop-band of interest ([−3, 0] cm/s) decreases with increasing B1 scale due to increasing actual B1 values of RF sub-pulses. Magnetization in the velocity pass-band of interest ([+5, +50] cm/s) is undesirably excited due to inaccurate 180° rotations by B1 scaled composite pulses, but only marginally in a B1 scale region of 0.85 to 1.15.
