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Operation Manual
Measurement by Item
In the Measurement menu, select an individual item and take a measurement.
1. Press the Calculator button on the control panel after obtaining a desired image.
2. Select the item you want from the Measurement menu. The + cursor will appear over the spectral
waveform.
3. Position the “+” cursor and press the Set button.
4. The measurement results for the selected item are displayed on the screen.
Item Category Unit Equation
PSV (Peak Systolic Velocity)
Velocity cm/s or m/s
ED (End Diastolic Velocity)
Velocity cm/s or m/s
Minimum Diastole Velocity (MD)
Velocity cm/s or m/s
PI (Pulsatility Index)
Calculation Ratio (PS-ED)/TAMAX
RI (Resistivity Index)
Calculation Ratio
(PS-ED)/PS or
(PS-MD)/PS
PS/ED (Ratio of PS to ED)
Calculation Ratio PS/ED
ED/PS (Ratio of ED to PS)
Calculation Ratio ED/PS
TAMAX (Time Average Max Velocity)
Velocity cm/s or m/s
TAMEAN (Time Average Mean Velocity)
Velocity cm/s or m/s
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