ECO 2 Ultrasound Diagnostic 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: 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 Frequency
In real status, press the first line button of [Frequency] to increase the frequency, and press the
second line button of [Frequency] to decrease the frequency.
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