
Q9 Digital Color Doppler Ultrasound System
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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.
Fig. 4-11 PW Mode
PW mode Exam Procedure:
Get a good B-mode image. Press C-knob to help locate the vessel you wish to examine.
Press PW-knob 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 (either B or Color) 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 (B or Color)
update and deactivate the Spectral Doppler.