5-16 Image Optimization
Persistence
Description This function is to adjust the temporal smooth to optimize the image.
Operation Rotate the knob under [Persistence] on the touch screen to adjust the parameters.
0 represents no persistence. The bigger the value is, the stronger the effect becomes.
Smooth
Description This feature is used to reject the noise and smooth the image.
Operation Rotate the knob under [Smooth] on the touch screen to adjust the parameters.
The bigger the value is, the higher the smooth becomes.
Scale
Description
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 left corner of the screen.
Operation Rotate the knob under [Scale] on the touch screen to complete the adjustment.
Effects To provide a much clearer color flow image.
Use low PRF to observe low-velocity flows, and use 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
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.
Rotate the knob under [Baseline] to complete the adjustment. Positive value means to
increase the signals below the baseline, and negative value means to increase the
signals above the baseline.
Invert
To set the display mode of the color flow, the color scale will be inverted when the
function is activated.
Tap [Invert] on the touch screen to complete the adjustment.
Then the color bar can automatically invert when the color flow is steered to a certain
angle to accommodate operators’ habit of distinguishing flow direction. Select [Auto
Invert] via [Setup]ïƒ [System Preset]ïƒ [Image].
It is available only for linear probes.
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