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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.

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