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Fig. 3. —Graph shows correlation of Doppler sonography with duplex MR imaging (large [UNK] = common carotid artery; small [UNK] = internal carotid artery; solid line = regression line, with y = 0.59x + 20.2; r = 0.83) and phase-contrast MR imaging (large = common carotid artery; small = internal carotid artery; dashed line represents regression line with y = 0.58x + 14.6; r = 0.75) for measurements in carotid arteries. Note that velocities as determined by sonography (x-axis) are on average higher compared with both MR imaging methods (y-axis) and that conventional phase—contrast measurements are, on average, higher than duplex MR measurements.