Scanning Modes
Vivid S5/Vivid S6 User Manual 161
R2424458-100 Rev. 2
When ROI is set to a deep region in the body it is
recommended to decrease the Color Frequency value setting
in order to improve reception of the Doppler signals.
When ROI is position in a shallow region, it is recommended to
increase the Color Frequency value setting in order to increase
the spatial resolution of the color image.
With Smart Depth turned ON, the system optimizes the Color
Frequency/Transmit Pattern using the above guideline, and
automatically sets an optimal setting to correspond with the
current location of Color-ROI. The associated Frequency value
displayed on screen changes accordingly.
The operator may change the Frequency control at any time to
any desired setting, overriding any automatic settings.
With Smart Depth turned OFF, the Frequency control setting
remains unchanged even while ROI depth setting is changed.
Lateral Averaging (Color 2D only)
Smoothes the image by averaging collected data along the
same horizontal line. An increase of the lateral averaging will
reduce noise, but this will also reduce the lateral resolution.
Radial Averaging
Use Averaging con-
trols with caution
so as not to obscure
significant diagnos-
tic information
Smooths the image by averaging collected data along the
same radial line. An increase of the radial averaging will reduce
noise, but this will also reduce the radial resolution.
Power
When power is re-
duced, it reduces
the signal-to-noise
ratio, so that the im-
age may become
noisier.
Controls the amount of acoustic power applied in all modes.
When power is set to maximum, it is equal to or less than the
maximum acoustic power permitted by the FDA. The Thermal
Index (TI) and the Mechanical Index (MI) are displayed on the
screen.
Trackball controls
ROI (Region Of Interest) size
When the trackball command Size is selected (see also
"Trackball operation" on page 108), the height and width of the
color area (or ROI) is adjusted from the trackball.
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