Image Optimization 5-17
Invert
This function is used to set the display manner of spectrum.
Turn on or off the function through the [Invert] item on the image menu.
Select “Auto Invert” in the “[Setup] → [System Preset] → [Image]”, thus the
spectrum can automatically invert when the color flow is steered to a certain
angle to accommodate operator’s habit of distinguishing flow direction.
Scale
This function is used to adjust the speed range of 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.
Press the <Scale> key on the control panel and rotate the Multifunctional
Knob on the right to adjust.
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.
Wall Filter
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.
Select through the [WF] item on the image menu.
There are 7 levels of wall filter function provided.
Signals of low-velocity flow may be missing.
T/F Res
This function is used to adjust for a balance between time resolution and
spatial resolution.
Adjust through the [T/F Res] item on the image menu.
There are 5 levels of T/F Res values available.
Dynamic Range
The dynamic range conveys the information that being transformed from echo
intensity to gray scale.
Adjust through the [Dynamic Range] item on the image menu.
The adjusting range is 24-72dB in increments of 2dB.
The more the dynamic range, the more specific the information, and the lower
the contrast with more noise.
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