ECO 2 Ultrasound Diagnostic System
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PW Doppler is typically used for displaying the speed, direction, and spectral content of blood flow
at selected anatomical sites.
PW Doppler can be combined with B mode for quick selection of the anatomical site for PW
Doppler examination. The site where PW Doppler data is derived appears graphically on the B
mode image (Sample Volume Gate). The Sample Volume Gate can be moved anywhere within B
mode image.
PW mode Exam Procedure:
Get a good B mode image.
Press [PW] key to display the sample volume cursor and gate.
Position the sample volume cursor by moving the Trackball left and right. Position or re-size the
sample volume gate by moving the Trackball up and down, then press [ENTER] key.
Press [UPDATE] key to display PW Doppler spectrum and the system will run in combined
B+Doppler mode. The Doppler signal can be heard through the speakers.
Optimize the PW Doppler spectrum as necessary.
Ensure that the sample line is parallel to the blood flow.
Press [FREEZE] key to hold the trace in cine memory and stop imaging.
Perform measurements and calculations, as necessary.
Record results with your recording devices.
Press [FREEZE] key to resume imaging.
Repeat the above procedure until all relevant flow sites have been examined.
Replace the probe in its respective holder.
When entering Duplex mode for the first time, the Doppler spectrum is not activated. The Doppler
Sample Volume appears in the default position, and the B mode image or 2D mode are active.
Moving the Trackball will change the Sample Volume position. Press the [ENTER] key to toggle
the Trackball 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 update and deactivate the Spectral Doppler.
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