SAEVO EVUS 8, Руководство пользователя

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6 Acquiring Images
Basic User Manual 69
0
5
Spectral Doppler Line
Flow Cursor
Sample Volume Gate
2D Imaging
S
Figure 6-11 Inactivated B+PW Mode 1 Imaging Screen
− The spectral Doppler line and the sample volume gate are used to locate the qualitative analysis on the
image.
−
The flow cursor needs to be adjusted parallel to the flow when measuring the velocity.
3. Adjust the position and angle of the spectral Doppler line.
− Position the sample volume gate on the spectral Doppler line by moving the trackball up or down.
−
Adjust the angle of the spectral Doppler line by moving the trackball left or right.
4. Adjust the sample volume gate.
− Adjust the size of the sample volume gate by moving the trackball.
−
Rotate the Angle knob to increase or decrease the angle of the flow cursor.
5. Select the
Update
key to activate the PW mode.
The PW spectrum is displayed at the lower part of the screen after being activated, as shown in Figure 6-12.
0
5
50
-50
cm/s
X-axis: Time
Y-axis:
Frequency
S
Figure 6-12 PW-Mode Imaging Screen
− X-axis is the time scale.
− Y-axis is Doppler frequency scale, including positive and negative indicators.
Select the Audio + or Audio - key to adjust the audio volume.
NOTE:
Once the PW mode is activated, you can move the trackball to stop the Doppler trace and adjust the
sample volume gate. The system continues tracing if the trackball is idle for more than 0.5s.