Scanning Modes
166 Vivid S5/Vivid S6 User Manual
R2424458-100 Rev. 2
LPRF (PW mode)
Sets the pulse repetition frequency for the PW Doppler
acquisition of flow data. Enables toggling between high and low
Pulse Repetition Frequency (PRF). When the Doppler PRF is
raised beyond a certain limit, more than one Doppler gate is
displayed on the screen.
D Color maps
Displays a drop down menu of different Doppler colorization
maps. Use the assignable rotary knob to select the desired
map and activate the map.
PW/CW Doppler Soft menu controls
Quick angle and Angle correction
In non-cardiac ap-
plications, Angle
correction is con-
trolled from the
Trackball.
Enables correction of the Doppler velocity scale by defining the
angle between the Doppler beam and the investigated blood
vessel or blood flow. A thin cross bar on the Doppler cursor will
rotate as the control is adjusted. Angle correction is available in
both Live and Freeze.
Quick angle adjusts the angle by 60 degrees.
Angle correction adjusts the angle between zero and
90 degrees with one degree increment.
Sample volume
In PW mode, set the longitudinal size of the region to be
sampled for measurement. Adjusting Sample volume may
affect the PRF (Nyquist limit) settings. SV does not apply to
CW mode, where the volume sampled is the full length of the
area indicated by the cursor line.
Compress
Enables control over the contrast of the Doppler spectrum.
When compression is raised, the spectrum image becomes
softer and some low level background noise may appear.
Compress is available in both Live and Freeze.
Reject
Enables undesirable background noise to be removed from the
Doppler spectrum resulting in a darker background. Reject is
available in both Live and Freeze.
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