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Optimizing Color Mode
The use of preset gives optimum performance with minimum
Refer to page 291
about creating pre-
adjustment. If necessary, the following controls can be adjusted
sets.
to further optimize the Color Mode display:
•
Adjust the Active mode gain to set the gain in the color
flow area.
•
Adjust Scale to the highest setting that provides adequate
The scale value may
affect FPS, Low Ve-
flow detection.
locity Reject, and
•
Adjust Low Velocity Reject to remove low velocity blood
Sample Volume.
flow and tissue movement that reduces image quality.
•
Adjust Variance to detect flow disturbances.
•
Adjust Sample volume (SV) to a low setting for better flow
resolution, or a higher setting to more easily locate
disturbed flows
•
Adjust Frequency to optimize the color flow display. Higher
Frequency setting
may affect FPS, SV
settings improve resolution. Lower settings improve depth
and Low Velocity
penetration and sensitivity. This does not affect the
Reject.
frequency used for 2D and M-Mode.
•
Adjust Power to obtain an acceptable image using the
The Power setting
affects all other op-
lowest setting possible.
erating modes.
Adjust the following settings to further optimize display of the
image:
•
Use Invert to reverse the color assignments in the color
flow area of the display.
•
Use Tissue priority to emphasize either the color flow
overlay, or the underlying greyscale tissue detail.
•
Use Baseline to emphasize flow either toward or away
from the probe.
•
Use Radial and Lateral Averaging to reduce noise in the
color flow area. Radial and Lateral Averaging smooths 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.
Use all noise reduction controls with care. Excessive
application may obscure low level diagnostic information.
CAUTION
Vivid i User's Manual
2378958-100 Rev. 02
Scanning Modes
93
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