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254 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1

Chapter 37: Acquiring PW Doppler Mode and PW Tissue Doppler Mode images

Simul

This toggle control sets the system to acquire live data simultaneously in both the B-

Mode scout window as well as the PW Doppler image window.

In the dual window view, use this feature when you want to adjust your sample volume

in the B-Mode scout window while you view the waveform data in the PW Doppler

Mode window.

To use this toggle control:

1. Press to activate the simultaneous state.

A black vertical strip scans across the spectrum from left to right.

2. To eliminate this striping, press the toggle again to freeze the scout window and

return to PW Doppler image data only.

Active during: M-Mode, PW Doppler Mode and PW Tissue Doppler Mode image

acquisition sessions.

Sweep Speed

Adjusts the cine loop playback speed parameter so that you can stretch out or compress

the cine loop data in the review window. Push up to increase the speed and compress the

cine loop image. Pull down to decrease the speed and expand the cine loop image.

When you are reviewing the cine loop you can also use the

Cine Loop Review

control to

adjust the sweep speed.

In PW Doppler Mode and PW Tissue Doppler Mode: Set the sweep speed parameter in

a range from 0.25 seconds at 4000 Hz to 5.1 seconds at 200 Hz. In some cases, if your

imaging window is large and the

Velocity

is set high, the minimum speed may be greater.

The system displays the updated values in the status bar in the lower left area of the

screen.

Wall Filter

Filters out signals that correspond to low velocity axial motion. Typically these include

vessel wall movement, cardiac wall movement and tissue movement caused by

respiration. Push up to filter out more. Pull down to filter out less.

In PW Doppler Mode: Use this control to filter out the display of low velocity signal

artifacting that appears as a horizontal black band along either side of the white baseline.

Push up to reduce the lower velocity signals and bring the waveform of the spectral data

closer to the baseline. Pull down to display more low velocity signals.

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VDO MG 2100 Specifiche Pagina 254