User guide

28 Imaging modes
PW and CW Doppler imaging
Pulsed wave (PW) Doppler and continuous wave
(CW) Doppler imaging modes are optional
features.
PW Doppler is a Doppler recording of blood flow
velocities in a range specific area along the length of
the beam. CW Doppler is a Doppler recording of
blood flow velocities along the length of the beam.
You can use PW/CW Doppler and CPD/Color
simultaneously. If CPD/Color imaging is on, the color
ROI box is tied to the D-line. The
SELECT key cycles
among color ROI box position; color ROI box size;
the D-line and gate location; and (in PW Doppler)
angle correction. The active selection is green. Also,
the indicator on the left-hand screen shows which
touchpad function is active.
To display the D-line
The default Doppler imaging mode is PW Doppler.
In cardiac exams, you can select the CW Doppler
on-screen control.
1 Press the
DOPPLER key.
Note: If the D-line does not appear, make sure
that the image isn’t frozen.
2 Do any of the following as needed:
• Adjust controls. See “PW Doppler
controls” on page 29.
• Using the touchpad, position the D-line and
gate where desired. Horizontal movements
position the D-line. Vertical movements
position the gate.
• (PW Doppler) To correct the angle
manually, do one of the following:
•Press the
SELECT key and then use the
touchpad.
The
SELECT key toggles between the
D-line and angle correction.
• Freeze the image, and then press the
keys.
You can adjust the angle in 2° increments
from -74° to +74°.
To display the spectral trace
1 Display the D-line.
2 Press the
DOPPLER key.
The time scale above the trace has small marks
at 200 ms intervals and large marks at
one-second intervals.
3 Do any of the following as needed:
• Adjust controls. See “Spectral trace
controls” on page 29.
•Press the
UPDATE key to toggle between the
D-line and spectral trace.
• If using a duplex layout, press the
DOPPLER
key to toggle between the full-screen D-line
and the duplex layout.
To set a duplex layout, see “Presets
setup” on page 22.
Variance Turns variance on and off.
Available only for cardiac exam.
Invert Switches the displayed direction of
flow.
Available in Color imaging.
Sector (Cardiac exam) Specifies the
sector width.
Page x/x Indicates which page of controls is
displayed. Select to display the
next page.