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310 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1
Chapter 43: Acquiring Color Doppler Mode images
Frequency
Adjusts the transmit frequency of the transducer between the higher and lower
frequency levels that are supported by the specific transducer. When you increase the
frequency you can improve detail at the focus depth but the system tends to lose detail at
deeper tissues.
Push forward to increase the frequency. Pull back to decrease the frequency.
Screen Keys
Press the dial to cycle through three image states: Color box overlay + B-Mode, B-Mode
only, Color box only.
Display Map
Cycles you through a predefined set of optimization maps that you can apply either
while you are acquiring or reviewing image data.
Push up or pull down to cycle through the available maps for the active imaging mode.
Transmit Power
Adjusts the power of the ultrasound signal transmission.
Turn clockwise to increase power. Turn counterclockwise to decrease power. Between
1% and 10% power the control adjusts power in increments of 1%. Between 10% to 100%
power the control adjusts in increments of 10%.
Persist
Applies a pixel averaging algorithm to the most recently acquired frames to produce a
more uniform view of the faster moving areas in the image data.
To use this rocker switch control:
Push up or down to cycle through the persistence levels. In the bottom-left corner of the
screen the status bar briefly displays the name of the persistence label as you select. In
Color Doppler Mode and Power Doppler Mode: Applies to the color signal data only. It
does not apply to the B-Mode background data. Levels: Off, Low, Med, High, Max.
Helpful when you are studying abdominal organ tissue such as liver, kidney and
pancreas.
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