ECO 6 Digital Color Doppler Ultrasound System
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function between Sample Volume Gate position and size. Press the [UPDATE] key after the Sample Volume
Gate is defined to activate the Spectral Doppler mode. Press the [UPDATE] key for second time to toggle
back to 2D (B or Color) update and deactivate the Spectral Doppler.
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: 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 ENTER)
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.
5.6 B Image Adjustment
5.6.1 Parameters Adiustment
In real status, rotate [GAIN] knob to adjust the Gain.
STC curves can be used for adjusting gain compensation in different image depth.
Drag the slide of STC to adjust the value.
STC curve will disappear automatically 1 second later after stopping adjustment.
Press [DEPTH_FOCUS] selection knob until the indicator of [FOCUS] is lit, and
rotate the knob to change Focus Position.
Press [DEPTH_FOCUS] selection knob until the indicator of [DEPTH] is lit, then
rotate the knob to change the depth of image.
Press [ANGLE/ZOOM] knob until the indicator of [ANGLE] is lit, and the angle of
sample gate will rotate with the rotation direction.
Press [ANGLE/ZOOM] knob to confirm the ZOOM button is lit, and it will appear the
zoom box, rotate the knob to select the zoom steps
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