Specifications

256 VisualSonics Vevo 2100 Imaging System Operator Manual Rev 1.1
Chapter 37: Acquiring PW Doppler Mode and PW Tissue Doppler Mode images
Velocity
Adjusts the PRF (pulse repetition frequency). The higher you set the PRF, the lower the
signal resolution. In PW Doppler Mode: Adjust the range of the scale of the Y axis on the
Power Doppler Mode image window by adjusting the pulse rate frequency of the
ultrasound signal. Use this control when the spectral waveform is either too compressed
or too expanded for your purposes.
Note: In the General tab of the Preferences window you can set the PW Doppler Scale (Y axis)
to display either velocity or frequency.
Turn the dial clockwise to compress the waveform by increasing the range of the scale.
Turn counterclockwise to expand the waveform by decreasing the range of the scale.
PW
Activates PW Doppler Mode acquisition. Press to begin displaying the yellow PW
Doppler Mode sample volume, press
Update
to display the live PW Doppler Mode
spectral data in the lower window and the live B-Mode data in the scout window, then
press
Simul
.
PW Doppler Mode acquisition settings
f To view the PW Doppler Mode acquisition settings:
Press
Mode Settings
.
The PW Doppler Mode acquisition settings panel displays the following
parameters, in addition to labeling the current transducer application and preset:
Transmit
Parameter Description
Frequency
The ultrasound frequency, measured in
MHz. Adjust with the
Frequency
control.
Power
The transmission power level of the ultrasound signal, displayed as a percentage of the
maximum power. Adjust with the
T
ransmit Power
control.
PRF
The pulse repetition frequency (PRF) of the transmitted PW Doppler signal, measured
in kiloHertz. This parameter defines the maximum observable PW Doppler frequency
shift and flow velocity. Adjust with the
Velocity
control.