Renal artery duplex ultrasonography as a screening and surveillance tool to detect renal artery stenosis: a comparison with current reference standard imaging.

Objective: Digital subtraction angiography quantitative vessel analysis (QVA) to assess percent renal arterial stenosis (RAS) is the reference standard. Quantitative vessel analysis is not ideal for screening purposes. Renal artery duplex ultrasonography (RADUS) is a noninvasive method to screen for RAS using well-known parameters.