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Operation Manual
Limited Trace
This is a basic measurement that is only available in Spectral Doppler mode. You can specify a point
in a Spectral Doppler image and trace a curve from that point to calculate the velocity, integral value,
and average velocity of blood flow.
1. Tap Limited Trace on the touch screen. A bar that you can use to specify range will appear.
2. Specify the measurement range.
X
Place the bar at a desired position with the trackball, and press the Set button.
3. The system traces spectrums within the specied range automatically.
4. When tracing is nished, the measurement is shown on the screen. The displayed measurement
results will vary, depending on the settings you have selected in Utility > Measurement Setup >
General > Caliper.
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
Acc: Acceleration
X
AccT: Acceleration Time
X
Dec: Deceleration
X
DecT: Deceleration Time
The equations used for Manual Trace measurement are as follows:
NOTE: The displayed measurement results for D Velocity, D A/B, Manual Trace, and Limited Trace
vary by application (General or Cardiac).
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