6 Acquiring Images
Basic User Manual 81
−
Adjust the angle of the spectral Doppler line by moving the trackball to the left or the right.
4. Rotate the
Angle
knob on the control panel to adjust the angle of the ow cursor.
5. Press the
Update
key on the control panel to activate the CW mode.
The CW spectrum is displayed at the lower part of the screen after being activated, as shown in Figure 6-18.
0
5
50
-50
cm/s
X-axis: Time
Y-axis:
Frequency
S
Figure 6-18 CW-Mode Imaging Screen
−
X-axis is the time scale.
−
Y-axis is Doppler frequency scale, including positive and negative indicators.
Rotate the
Audio
knob on the control panel to adjust the audio volume.
NOTE:
Once the CW-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.
6. Optimize the CW-mode image. For details, refer to Section 6.5.3 Optimizing Spectral Doppler Images.
If needed, press the Update key on the control panel to enter the inactivated B+CW mode 2, the following
screen appears.
0
5
50
-50
cm/s
X-axis: Time
Y-axis:
Frequency
S
Figure 6-19 Inactivated B+CW Mode 2 Imaging Screen
You can also adjust the position and angle of spectral Doppler line, and the direction of the ow cursor.
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