GE Versana Balance, Basic Service Manual

Page: 246 / 431

General Procedures and Functional Checks
4-60 System view Versana Balance – Basic Service Manual
5808768-100 English Rev.9
4-4-9-5 Select Color M Mode
1. Select M Mode.
2. Use the trackball to position the ROI frame over the area to
be examined.
3. Press
Set
. The instruction
Size
should be highlighted in the
trackball status bar. Use the trackball to adjust the
dimension of the ROI.
4-4-9-6 Adjust the Color M Mode controls
• Adjust the Active mode gain to set the gain in the color flow
area.
Adjust Scale to the highest setting that provides adequate
flow detection.
NOTE: The scale value may affect FPS, Low Velocity Reject, and
Sample Volume.
Adjust
Wall Filter
to remove low velocity blood flow and
tissue movement that reduces image quality.
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
settings improve resolution. Lower settings improve depth
penetration and sensitivity. This does not affect the
frequency used for 2D and M-Mode.
NOTE: NOTE: Frequency setting may affect FPS, SV and Low
Velocity Reject.
Adjust PowerOutput to obtain an acceptable image using
the lowest setting possible.
NOTE: The Power setting affects all other operating 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
Threshold
to emphasize either the color flow overlay,
or the underlying grey scale tissue detail.
Use Baseline to emphasize flow either toward or away from
the probe.