User guide

Chapter 3: Imaging 29
Imaging
PW Doppler controls
In PW Doppler imaging, you can set the following
on-screen controls.
Spectral trace controls
In spectral trace imaging, you can set the following
on-screen controls.
PW, CW (Cardiac exam only) Toggle
between PW Doppler and CW
Doppler.
The current selection appears in
the upper left-hand screen.
Angle
Correction
Corrects the angle to 0°, +60°, or
-60°.
Gate Size Settings depend on transducer and
exam type.
In TCD or Orb exams, use the
touchpad to specify the Doppler
gate depth (the depth of the
center of the gate in the Doppler
image). The Doppler gate depth
indicator is on the lower right-hand
screen.
TDI On,
TDI Off
Select TDI On to turn on tissue
Doppler imaging. When on,
TDI
appears in the upper left-hand
screen. The default is TDI off.
Available only in cardiac exams.
Steering Select the desired steering angle
setting. Settings available depend
on the transducer. The PW Doppler
angle correction automatically
changes to the optimum setting.
• -15 and -20 have an angle
correction of -60°.
• 0 has an angle correction of 0°.
• +15 and +20 have an angle
correction of +60°.
You can manually correct the angle
after selecting a steering angle
setting. (See “To display the
D-line” on page 28.)
Available on select transducers.
Page x/x Indicates which page of controls is
displayed. Select to display the
next page.
Scale Select the desired scale (pulse
repetition frequency [PRF])
setting.
(To change the Doppler scale to
cm/s or kHz, see “Presets
setup” on page 22.)
Line Sets the baseline position.
(On a frozen trace, the baseline
can be adjusted if Live Trace is
off.)
Invert Vertically flips the spectral trace.
(On a frozen trace, Invert is
available if Live Trace is off.)
Volume Increases or decreases Doppler
speaker volume (0-10).
Wall Filter Settings include Low, Med, High.
Sweep
Speed
Settings include Slow, Med, Fast.
Live Trace Displays a live trace of the peak or
mean. (See “Presets setup” on
page 22 to specify peak or mean.)
Page x/x Indicates which page of controls is
displayed. Select to display the
next page.