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Fig. 2B. —61-year-old man with hypertension and questionable abdominal bruit. MR phase-contrast measurements taken from right (A) and left (B) renal hila at baseline (without angiotensin-converting enzyme inhibitor) show mean velocity values (centimeters per second) within region of interest placed over renal arteries, measured at multiple points during one heart cycle (744 msec). Plots are superimposed on selected phase-contrast image on which region of interest (short arrows) is shown. Velocity waveform for left renal artery is inverted because flow direction is encoded as left to right. Both waveforms show pattern II-type curves with normal sharp systolic upstroke and early systolic peak (long arrows).

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