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Fig 2. A, Flow volume measurement of left vertebral artery by different sonographic techniques and MR phase-contrast imaging in a 29-year-old subject. With CDI the vessel diameter was measured as 0.35 mm and the flow volume was calculated as 135.70 mL/min.
B, With PDI, the vessel diameter was measured as 0.37 mm and the flow volume was calculated as 137.40 mL/min.
C, With B-flow imaging the vessel diameter was measured as 0.29 mm and the flow volume was calculated as 90.77 mL/min.
D, MR phase-contrast flow quantification (TR/TE, 29/7.7) of the same vertebral artery revealed a blood-flow volume of 77.0 mL/min.
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