Normal RI KSA =   0,53


                      PSV KSA – EDV KSA

RI KSA =     -----------------------------------

                              PSV KSA

RI KSA -  Resistive Index Kidney Segmental Artery

EDV KSA -  End Diastolic Velocity Kidney Segmental Artery
PSV KSA -  Peak Systolic Velocity Kidney Segmental Artery