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Chapter 5 Measurements and Calculations
Manual Trace
This is a basic measurement that is only available in Spectral Doppler mode. You can specify a line in
a Spectral Doppler image and trace a curve from that line to calculate the velocity, integral value, and
average velocity of blood flow.
1. Tap Manual Trace on the touch screen. The measurement cursor will appear over the spectrum.
2. Trace the spectrum.
3. When Trace is complete, the measurement results are displayed on the screen.
4. When the measurement is nished, its result is shown on the screen. The displayed measurement
results will vary, depending on the settings you have selected in Utility > Measurement Setup >
General > Caliper > D Trace.
X
PSV: Peak Systolic Velocity
X
EDV: Edn Diastolic Velocity
X
PI: Pulsatility Index
X
RI: Resistivity Index
X
S/D: Ratio of PSV to EDV
X
Vmean: Mean Velocity
X
AccT: Acceleration Time
X
Dec: Deceleration
X
DecT: Deceleration Time
The equations used for Manual Trace measurement are as follows:
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