5-16 Image Optimization
Scale
Description This function is used to adjust the speed range of the color flow, which is
adjusted using the PRF in the system. The real-time PRF value is
displayed in the image parameter area in the top-right corner of the
screen.
Operations Adjust through the [Scale] item on the touch screen.
The adjusting range varies according to the frequency, probe and depth.
Adjust according to the actual situation.
Effects Provides a much clearer color flow image.
Use a low PRF to observe low-velocity flows, and a high PRF to observe
high-velocity flows.
Impacts Aliasing may occur if a 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.
Operations Adjust through the [Baseline] item on the touch screen.
A positive value means increase the signals above the baseline, and a
negative value means increase the signals below the baseline.
Invert
Description To set the display mode of the color flow. The color scale will be inverted
when the function is turned on.
Operations Turn the function on or off using the [Invert] item on the touch screen.
Select “Auto Invert” in “[Setup] (F10)Æ[System]Æ[Image]”, so the color
bar can automatically invert when the color flow is steered to a certain
angle to accommodate the operator’s desire to distinguish the flow
direction.
Auto invert function is available only for linear probes.
Map
Description This function is a combination of several image parameters, which
indicates the display effect of the color image.
Operations Rotate the knob under the [Map] item on the touch screen to select from
among the maps.
The system provides 21 different maps for selection. The V group provides
11ordinary maps and the VV group provides 10 2D maps.
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