
5-28
Operation Manual
Measurement items for Doppler Spectrum are as follows:
Item Type Unit Equation
PSV (Peak Systolic Velocity) Velocity cm/s or m/s
EDV (End Diastolic Velocity) Velocity cm/s or m/s
TAMV (Time Average Mean Velocity) Velocity cm/s or m/s
TAPV (Time Average Peak Velocity) Velocity cm/s or m/s
PGmean (Mean Pressure Gradient) Calculation mmHg
PGmax (Max Pressure Gradient) Calculation mmHg 4 × PSV 2
S/D (Ratio of PSV to EDV) Calculation Ratio (PSV / EDV)
D/S (Ratio of EDV to PSV) Calculation Ratio EDV /PSV
RI (Resistivity Index) Calculation Ratio (PSV – EDV) / PSV
PI (Pulsatility Index) Calculation Ratio (PSV – EDV) / Vmean
Tips!
Taking measurements via Auto Calc
You can use Auto Calc to take measurements on predetermined item(s).
Items measured are as follows. For information on setting measurement item(s), please refer to “Auto
Calc” in "Chapter 7. Utility.’
X
Peak Systolic Velocity (PSV)
X
Time Averaged Mean Velocity (TAMV)
X
End Diastolic Velocity (EDV)
X
Diastole / Systole Ratio (D/S)
X
Time Averaged Peak Velocity (TAPV)
X
Max Pressure Gradient (PGmax)
X
Resistive Index (RI)
X
Mean Pressure Gradient (PGmean)
X
Pulsatility Index (PI)
X
Velocity Time Integral (VTI)
X
Systole / Diastole Ratio (S/D)
X
PeakA
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