PSV RA
RAR = --------------------------
PSV AA
RAR - Renal Artery Ratio
PSV RA - Peak Systolic Velocity Renal Artery
PSV AA - Peak Systolic Velocity Abdominal Aorta
PSV AA should be taken:
- in a long axis of the AA,
- in the center of the AA,
- between SMA and Renal Arteries.
The Renal Arteries:
- are located approximately 1-2 cm below SMA.