A simple objective parameter for perfusion study of renal transplant

We proposed a simple parameter, the kidney-to-aorta ratio (KAR), for evalua tion of renal transplant perfusion. KAR was calculated from the peak counts of the kidney and the aorta. The calculated values were compared with the visual interpretation of the radionuclide first-pass flow study, percent re nal uptake (%RU), and tubular extraction rate (TER) by Bubeck's one point s ampling method in 37 studies. KAR correlated well with the visual interpret ation of the flow study and the other quantitative parameters. Representati ve cases, which showed the usefulness of KAR for the objective assessment o f the perfusion status of renal transplants, were presented. In conclusion, KAR is a simple and practically useful parameter for objective evaluation and follow-up of renal transplant perfusion.