
Chapter 5 Measurements and Calculations
5-25
3. The system automatically traces spectrums within the specied range.
4. Once tracing is complete, the measurement results are displayed on the screen.
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Manual Trace
This method traces a spectrum manually. This becomes enabled in the menu when in Spectral
Doppler Mode.
1. Select Manual Trace in the measurement menu. A measurement cursor appears over the
spectrum.
2. Trace the spectrum. The measuring method is the same as in “D Trace”.
3. Once tracing is complete, the measurement results are displayed on the screen.
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Measuring Item by Item
In the measurement menu, select an individual item and measure it.
1. Press the Calc button after obtaining a desired image.
2. Select a desired item in the measurement menu. The “+” cursor appears 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.
The following measurement items are available for Doppler Spectrum:
Item Type Unit Formula
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
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