Scanning Modes
98
Vivid i User’s Manual
2378958-100 Rev. 02
Using PW/CW Doppler modes
Controls and oper-
ations for PW and
CW mode are the
same unless other-
wise noted.
There are two ways to start PW/CW Doppler:
Alternative 1
1.
Press
PW
or
CW
. A scanning screen is displayed with a
Doppler cursor on the 2D mode image and a Doppler
spectrum in the lower part of the screen.
2.
Use the
trackball
to position the Doppler cursor line and in
PW the sample volume location over the area of interest.
Sample Volume ad-
justment may affect
the Scale, Frame
rate and LV rej. set-
tings.
3.
In PW, with the
Soft menu rocker key
, adjust the sample
Volume (SV):
To enlarge the SV, press the
Right arrow
of the rocker
To narrow the SV, press the
Left arrow
of the rocker.
Alternative 2
1.
Press
CURSOR
on the control panel. A cursor line is
displayed on the 2D image.
2.
With the
trackball
adjust the position of the cursor line.
3.
Press
PW
or
CW
.
Optimizing PW/CW Doppler modes
Refer to page 291
about creating pre-
sets
The use of preset gives optimum performance with minimum
adjustment. If necessary, the following controls can be adjusted
to further optimize the PW/CW modes display:
• Adjust
the
Active mode gain
to set the gain in the spectral
Doppler area.
• Adjust
Low velocity reject
to reduce unwanted low
velocity blood flow and tissue movement.
•
In PW mode, adjust
Sample volume
to low setting for
better resolution, or higher setting to more easily locate the
disturbed flows.
• Adjust
the
Compress
setting to balance the effect of
stronger and weaker echoes and obtain the desired
intensity display.
Frequency and
Frame rate settings
may affect the Low
Velocity Reject.
• Adjust
Frequency
to optimize flow display. Higher setting
will improve resolution and the lower setting will increase
the depth penetration.
• Adjust
Frame rate
to a higher setting to improve motion
detection, or to a lower setting to improve resolution.
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