Samsung ACCUVIX XG Manual do Utilizador Página 256

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5-16
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 specied 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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