Figure 1From: Diagnostic role of new Doppler index in assessment of renal artery stenosis Renal renal ratio at right renal artery stenosis. Panel a. Renal peak systolic velocity at the proximal segment of the right renal artery: 348 cm/s. Panel b. Renal peak systolic velocity at the distal renal artery segment : 72.9 cm/s. Renal-renal ratio = 348 cm/s / 73 cm/s = 4.76 (significant renal artery stenosis > 2.7).Back to article page