Parametric imaging applied to renal digital subtraction angiography: establishment of normal ranges.

Digital subtraction angiography is able to provide simultaneous information on renal structure and function. Thirteen normal patients were investigated. Parametric analysis was performed and a set of normal ranges was established for T-1/2 max, T-max, and renal-artery-to-renal-vein peak-to-peak transit time. Cases are presented to show that the technique is capable of identifying the normal kidney and differentiating it from abnormalities of intrarenal perfusion based on the detailed analysis of the vascular nephrogram.