5-14 Image Optimization
Operations
Turn on or off the function through the [Invert] item on the image menu.
Select “Auto Invert” in the “[Setup]
→
[System Preset]
→
[Image]”, 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.
Priority
Description
This function is used to set levels of the flow display, to display the grayscale
signal or color signal.
Operations
Click the [Priority] item on the image menu to select the value.
The adjusting range of the priority is 0-100%.
The higher the value, color signals are prior to be displayed; while the lower
the value, grayscale signals are prior to be displayed.
Packet Size
Description
This function is an indication of the ability to detect flow, which is used to
adjust the accuracy of color flow.
Operations
Click the [Packet Size] item on the image menu to adjust the value.
There are 3 levels of packet size available, 0 represents no packet size control
and the bigger the value the higher the sensitivity.
Effects
The higher the packet size, the more sensitive indication for low-velocity flow.
Impacts
Adjusting the packet size may lead to frame rate changing.
Persistence
Description
This function is to adjust the temporal smooth in Color mode to optimize the
image.
Operations
Click the [Persistence] item on the image menu.
The system provides 4 levels of persistence adjustment, 0 represents no
persistence and the bigger the value the stronger the effect.
WF (Wall Filter)
Description
It filters out low-velocity 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 right corner of the screen.
Operations
Click the [WF] item on the image menu.
There are 8 levels of wall filter function available, and adjust according to the
actual situation.
Impacts
Flow signals may be missing.
Color Map
Description
This function is a combination of several image parameters, which indicates
the display effect of color image.
Operations
Click the [Map] item on the image menu to select among the maps.
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.
