Image Optimization 5-13
Operation Adjust the speed range through the [Scale] item in the menu or the soft
menu.
The adjusting range varies by frequency, probe and depth; adjust
according to the actual situation.
Effects To provide a much clearer color flow image.
Use low PRF to observe low-velocity flows, and high PRF to observe high-
velocity flows.
Impacts Aliasing may occur if low velocity scale is used and high velocities are
encountered.
Low velocities may not be identified when a high velocity scale is used.
Baseline
Description Refers to the area where the velocity is zero in the scale. Adjust according
to the actual situation so as to get an optimum flow display.
Operation Adjust through the [Baseline] item in the soft menu.
Positive value means to increase the signals above the baseline, and
negative value means to increase the signals below the baseline.
Impacts The function is available in real-time imaging, freeze or cine review status.
Invert
Description To set the display mode of the color flow, and the color scale will be
inverted when the function is turned on.
Operation Turn on or off the function through the [Invert] item in the soft menu.
Select "Auto Invert" in the "[Setup] → [System Preset] → [Image Preset]",
then the color bar can automatically invert when the color flow is steered
to a certain angle to accommodate operator’s habit of distinguishing flow
direction.
Impacts The function is available in real-time imaging, freeze or cine review status.
Map
Description This function is a combination of several image parameters, which
indicates the display effect of color image.
Operation Select among the maps through the [Map] item in the soft menu.
You can also adjust through the color bar: move the cursor to the color bar
and press <Set> on the control panel to adjust.
The system provides 21 different maps to be selected among, where the V
group provides 11 ordinary maps and the VV group provides 10 2-D maps.
Impacts The function is available in real-time imaging, freeze or cine review status.
WF (Wall Filter)
Description It filters out low-frequency signals to provide effective information, and this
function is used to adjust the filtered frequency. The real-time value is
displayed in the image parameter area in the upper left corner of the
screen.
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