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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Magn Reson Med. 2012 Apr 9;69(2):402–410. doi: 10.1002/mrm.24266

FIG. 2.

FIG. 2

Bloch equation simulation results for longitudinal magnetization of spins flowing at 5, 20, 35 and 50 cm/s (top row) after application of PCASL pulse trains as a function of phase offset θ for (a) tag, and (b) control conditions, and (c) subtracted (control-tag) signal. Average longitudinal magnetization assuming laminar flow with maximum velocity at 50 cm/s, for (d) tag and (e) control conditions, and (f) subtracted (control-tag) signal. All data, except the green/red line in (f), were calculated assuming a homogenous field. Solid green line in (f) represents the tagging efficiency for off-resonance field of 100 Hz at the tagging location and the dashed red line is the fit to a cosine function to determine the phase offset.