Image Optimization 5-17 
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 top-right corner of the 
screen. 
Operations  Select using the [WF] item on the touch screen. 
There are 0-7 levels of wall filter function available. Select the value 
according to the actual situation. 
Impacts  Flow signals may be missing. 
 
Priority 
Description  This function is used to set the levels of the flow display and to display the 
grayscale signal or color signal. 
Operations  Rotate the knob under the [Priority] item on the touch screen to select the 
value. 
The adjusting range of the priority is 0-100% in increments of 10%. 
The higher the value, color signals are first to be displayed. The lower the 
value, grayscale signals are first to be displayed. 
 
Velocity tag 
Description  This function is used to mark the specified velocity range in the flow to 
check the flow function or specific flow velocity value. 
Operation  1.  Tap [Velocity Tag] on the touch screen to enter the velocity marking 
status. A green mark appears on the color bar. 
2.  Roll the trackball upwards and downwards to select the marking 
velocity. 
3.  Press <Set> to enter the tag range selection status, and roll the 
trackball upwards and downwards to select the range. 
Press <Set> to switch between marking position and marking range. 
 
iTouch (Auto Image Optimization) 
Description  To optimize image parameters as per the current tissue characteristics for 
a better image effect. 
Operations  Press <iTouch> on the control panel to turn the function on.