Table 1.

Parameters calculated by CDI.

PSV	Peak Systolic Velocity
EDV	End Diastolic Velocity
RI	Resistive Index, RI = (PSV − EDV)/PSV.
MFV	Mean Flow Velocity
PI	Pulsatility Index, PI = (PSV-EDV)/mean velocity
ESA	Early Systolic Acceleration
AT	Acceleration Time
Sm	Mean velocity of the systolic wave components
Dm	Mean velocity of the diastolic wave components
Sm/Dm	The ratio of average velocities
Vmax	Maximum venous velocity
Vmin	Minimum venous velocity