Image Optimization 5-17
Scale
This function is used to adjust the speed range of color flow, which is adjusted
through PRF in the system. The real-time PRF value is displayed in the image
parameter area in the upper right corner of the screen.
Use the <Scale> deflector rod on the control panel to adjust.
The adjusting range varies by frequency, probe and depth; adjust according to the
actual situation.
To provide a much clearer color flow image.
Use low PRF to observe low-velocity flows, and high PRF to observe high-velocity
flows.
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
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.
Use the <Baseline> deflector rod on the upper right part of the control panel to
adjust.
Positive value means to increase the signals above the baseline, and negative
value means to increase the signals below the baseline.
Invert
To set the display mode of color flow and the color scale will be inverted when the
function is turned on.
Turn on or off the function through the [Invert] item on the touch screen.
Select ―Auto Invert‖ in the ―[Setup] (F10) → [System] → [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.
Color Map
This function is a combination of several image parameters, which indicates the
display effect of color image.
Rotate the knob under the [Color Map] item on the touch screen 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.
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