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The purpose of this study was to evaluate the level of agreement between flow/velocity data obtained from 2D-phase-contrast (PC) and 4D-flow in patients scheduled for treatment of carotid artery stenosis. Image acquisition was performed using a 1.5 T scanner. We compared mean flow rates, vessel areas, and peak velocities obtained during the acquisition with both techniques in 20 consecutive patients, 15 males and 5 females aged 69 ± 5 years (mean ± standard deviation). There was a good correlation between both techniques for the CCA flow (<i>r</i> = 0.65, <i>p</i> < 0.001), whereas for the ICA flow and ECA flow the correlation was only moderate (<i>r</i> = 0.4, <i>p</i> = 0.011 and <i>r</i> = 0.45, <i>p</i> = 0.003, respectively). Correlations of peak velocities between methods were good for CCA (<i>r</i> = 0.56, <i>p</i> < 0.001) and moderate for ECA (<i>r</i> = 0.41, <i>p</i> = 0.008). There was no correlation for ICA (<i>r</i> = 0.04, <i>p</i> = 0.805). Cross-sectional area values between methods showed no significant correlations for CCA (<i>r</i> = 0.18, <i>p</i> = 0.269), ICA (<i>r</i> = 0.1, <i>p</i> = 0.543), and ECA (<i>r</i> = 0.05, <i>p</i> = 0.767). Conclusion: the 4D-flow imaging provided a good correlation of CCA and a moderate correlation of ICA flow rates against 2D-PC, underestimating peak velocities and overestimating cross-sectional areas in all carotid segments.