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Color Imaging Scanning Adjustments

Learn about the Color Imaging Scanning Adjustments like Color Gain, Position and Resize ROI, Color Steer and Color Aliasing


NOTE: The color images can be zoomed by pinching the images with two fingers.
NOTE: The active gain control is disabled as long as the TGC controls are active.

Color Gain

Color gain amplifies the overall strength of echoes processed in the color area.

1. Swipe at least half a centimeter from the left or right on the scan screen to initiate gain.

NOTE: Small movements will be ignored to avoid unintentional activation of the color gain control.

2. Move your finger to the right or left outside the color ROI to increase or decrease color gain.

Position and Resize ROI

The size of the Region of Interest (ROI) has an effect on the frame rate. The width of the ROI has a significant effect on frame rate even more than the height of the ROI. Keep the box sized just to the anatomy of interest and as close to center as possible.

Drag your finger inside the ROI to move and position. The box turns blue indicating that the controls for adjusting the ROI are activated. Use the controls on the corners to adjust size.


Position and resize ROI 

a. Flat linear array color flow

b. Curved linear array color flow

  1. Resize ROI
  2. Steer ROI
  3. Nyquist/velocity bar
  4. Move ROI
  5. Color flow gain (left/right gesture)

Color Steer

Slant the ROI (Region of Interest) of the Color Flow linear image left or right to get more information without moving the Vscan Air CL probe. 

Use the controls on the center top and bottom to steer the angle.

NOTE: Color steer applies only when using the linear array transducer of the Vscan Air CL.

Color Aliasing

If the blood flow velocity exceeds the Nyquist limit indicated by the number displayed with the velocity bar aliasing may occur.

Aliasing appears as a shift in color from the color representing positive velocity to color representing negative velocity or visa versa.

Positive velocity indicates flow towards the transducer and negative indicating flow away from the transducer.

The maximum velocity or Nyquist limit is displayed on top of the velocity bar.

Disclaimer: The information herein is not intended to replace the product’s User Manual. Please consult the User Manual for comprehensive information and cautionary guidance about the product’s operation and use.

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