GE Voluson S6 Basic User Manual page 181

8.1.2.2 Activation of PW Mode
8.1.2.3 PW Gain Control
8.1.2.4 PW Automatic Optimization
Voluson® S6/S8 Basic User Manual
5433669-100 Revision 4
By pressing the left or right trackball key the screen is divided asymmetrically. The 2D image
appears on top, below the PW spectrum starts running. Two display formats and three display
sizes are possible.
•
on page 7-8
'Display Format'
•
on page 7-8
'Display Size'
The menu area shows the "PW Main" menu.
Press the left trackball key to start the spectral display. The 2D image will be frozen. Press
the left trackball key once more; the PW spectrum will be frozen and the 2D image returns to
scan mode.
Press the right trackball key and both modes (2D image and PW spectrum) are active.
PW Gain controls the amplification of the incoming Doppler signals. The Doppler gain should
be adjusted to a level that fills in the grayscale of the spectral analysis waveform without
creating noise.
[PW Mode] key Rotation adjusts the amplification (brightness) of the entire displayed
spectrum.
When the GAIN control is turned clockwise the entire spectrum gets brighter. When the
GAIN control is turned counterclockwise the entire spectrum gets darker.
Remarks:
•
The actual gain value is displayed on the screen [GN ...].
•
Changing the PW gain is only possible in scan mode independent from additional modes
such as Color.
This function will optimize the following settings: PRF: automatic detection of highest flow
velocities and adjustment of the velocity scale(PRF) Baseline: will be shifted so that the flow
spectrum is centered
Pressing the [auto] key enables automatic optimization of the PRF and Baseline.
When the key is pressed again, the optimization will be updated.
Double-click the [auto] key to switch off the Automatic Optimization in PW mode.
Remarks:
•
When the Automatic Optimization function is active, the [auto] key is brightly illuminated.
•
The PRF and Baseline can always be changed manually!
Doppler Modes
8-5