Scanning Modes
Vivid S5/Vivid S6 User Manual 159
R2424458-100 Rev. 2
Color Mode controls
Color Mode assignable controls
Horizontal sweep (Color M-Mode only)
Adjusts the horizontal refresh rate of the M-Mode area of the
display.
Scale
Adjusts the repetition rate of the Doppler pulses transmitted to
acquire the data for color flow mapping. The Scale (Nyquist
limit) should be adjusted so that no aliasing occurs, while still
having good resolution of velocities. The Nyquist limit should
be somewhat above the maximum velocity found in the data.
Baseline
Adjusts the color map to emphasize flow either toward or away
from the probe. Baseline is available in both Live and Freeze.
Frame rate
Controls the Frame-rate by changing line density. When
adjusting frame rate, there is a trade off between spatial and
temporal resolution.
LVR (Low Velocity Rejection)
Color data produced
by very low flow
may cause interfer-
ence.
LVR, also called Wall motion filter, enables the extent of low
velocity removal to be adjusted.
Invert
Enables the color scheme assigned to positive and negative
velocities to be inverted. Invert is available in live and cine
replay.
Variance
Controls the amount of variance data added to a color display.
Variance enables computer-aided detection of turbulent flow
(e.g. jets or regurgitation). Variance is available in live and cine
replay.
Simultaneous
Enables simultaneous display of 2D and Color mode,
side-by-side.
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