BenQ T3300 - Adjusting Pulse Repetition Frequency (PRF); Inverting the Color Display; Using Directional Power; Selecting a Color Map

Using Image Controls
T3300 Diagnostic Ultrasound System | 83 | B00601-010 4/10/17
7.2.2 Adjusting Pulse Repetition Frequency (PRF)
Adjust the velocity range of the color flow display. The maximum velocity range depends on the
transducer in use and the location of the sample volume. Set the PRF high enough to prevent
aliasing, and low enough to provide adequate detection of slow blood flow. Upon adjusting the PRF
value, the velocity scale shown on the Color/Power wedge and the Wall Filter setting are changed
accordingly.
Touch Scale +/- to adjust the value.
7.2.3 Inverting the Color Display
Invert the color display in relation to the blood flow direction in Color mode. Normally, the color red is
assigned to positive frequency shifts (flow toward the transducer), and blue is assigned to negative
frequency shifts (flow away from the transducer). Use this function to reverse this color assignment
and invert the colors on the color wedge.
Touch Invert to invert the color scale.
7.2.4 Using Directional Power
Activate Directional Power in Power mode for use in applications where sensitivity and directional
information are both required.
Touch Directional to enable this function.
7.2.5 Selecting a Color Map
Select which of five color maps is used to show Color Doppler data. Some maps use more colors
than others, while some display in a smoother gradient than others.
Touch Color Map +/- to select a color map.
7.2.6 Adjusting Wall Filter
Reduce or eliminate unwanted low-frequency, high-intensity signals generated by movements of
blood vessel walls or by rapid movement of the transducer. Set the wall filter high enough to ensure
that the Color Doppler flash artifacts from tissue or wall motion are not displayed, but low enough to
display slow flow. The adjustable range of the Wall Filter value is related to the current PRF value.
Touch Wall Filter +/- to adjust the value.
7.2.7 Applying the Smoothing Filter
Reduce color noise by applying a smoothing filter to the image.
Touch Smoothing +/- to adjust the value.
7.2.8 Adjusting the Color Priority
Define the amount of color displayed over bright echoes, and help confine color within the vessel
walls.
Touch Reject +/- to adjust the value.
7.3 M-Mode Image Controls
7.3.1 Overview
M-Mode imaging is used simultaneously with 2-dimensional (B-mode) imaging to determine patterns
of motion for objects within the ultrasound beam. M-Mode displays scan data of the anatomy in the