
Q9 Digital Color Doppler Ultrasound System
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Doppler mode Scanning Hints:
The best Doppler data will be got when the scanning direction is parallel to the direction of the blood flow; when
the scanning direction is perpendicular to the anatomic target, you can get the best B mode image, so you should
keep the balance as you don’t usually get both an ideal B-mode image and ideal Doppler data simultaneously.
PRF: adjust the velocity scale to accommodate faster/slower blood flow velocity. Velocity scale determines pulse
repetition frequency.
Wall Filter: remove the noise caused by vessel or heart wall motion at the expense of low flow sensitivity.
Baseline: adjust the baseline to accommodate faster or slower blood flows to eliminate aliasing.
Angle Correct:
optimize the accuracy of the flow velocity. It estimates the flow velocity in a direction at an angle
to the Doppler vector by computing the angle between the Doppler vector and the flow to be measured. This is
special useful in vascular applications where you need to measure velocity.
Doppler Gain: allow you to control the background information of spectral.
Sweep Speed: control speed of spectral update.
Doppler Sample Volume Gate Position and Size (Trackball and SET)
Move the sample volume on the B-mode’s Doppler cursor. The gate is positioned over a specific position within
the vessel.
To move Doppler cursor position, turn the trackball left or right until positioned over the vessel.
To move sample volume gate position, move the trackball up or down until positioned inside the vessel.
To size sample volume gate, press Enter-key to toggle trackball function from sample volume gate
positioning to sizing, then move the trackball to change sample volume gate size.
Activating Triplex mode
While in B mode, press C-knob and D-knob to access the B+Color mode, turn triplex menu on,
press the UPDATE-key to enter the Doppler active mode.
While in B mode, press CPA-key and D-knob access the B+PD mode, turn triplex menu on, press
the UPDATE-key to enter the Doppler active mode.
4.3.13.
CW Mode
Continuous Wave Doppler allows examination of blood flow data all along the Doppler cursor rather than from
any specific depth. Gather samples along the entire Doppler beam for rapid scanning of the heart. Range gated CW
allows information to be gathered at higher velocities.
It works with a phased array or pediatric probe.
If the velocity of the blood flow is even too high for the HPRF mode to detect, you have to try CW mode.
Press CW-key to enter CW mode when the probe supports CW mode.
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