6 Acquiring Images
Basic User Manual 79
Perform the following steps to acquire PW-mode images
1. Optimize a B-mode image.
2. Press the
PW
key on the control panel to enter the inactivated B+PW mode 1.
0
5
Spectral Doppler Line
Sample Volum Gate
Flow Cursor
2D Imaging
S
Figure 6-14 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 ow cursor needs to be adjusted parallel to the ow 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 upwards or
downwards.
−
Adjust the angle of the spectral Doppler line by moving the trackball to the left or the right.
4. Adjust the sample volume gate.
−
Adjust the size of the sample volume gate by using the trackball.
−
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 PW mode.
The PW spectrum is displayed at the lower part of the screen after being activated, as shown in Figure 6-15.
0
5
50
-50
cm/s
X-axis: Time
Y-axis:
Frequency
Spectral Doppler Line
Flow Cursor
Sample Volume Gate
2D Imaging
S
Figure 6-15 PW-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 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.