GE H
EALTHCARE
D
IRECTION
FC091194, R
EVISION
11
V
IVID
7 S
ERVICE
M
ANUAL
Chapter 4 - Functional Checks
4 - 45
4-3-8-5
Check Horizontal Sweep, PRF, Baseline, LVR and Invert
Table 4-14 Color Flow Mode Controls Check
Step
Task
Expected Result(s)
1.
Adjust Horizontal Sweep (Color M-Mode only)
Adjusts the horizontal refresh rate of the M-Mode area
of the display.
2.
Adjust Baseline
Adjusts the color map to emphasize flow either toward
or away from the probe.
Baseline is available in both Live and Freeze.
3.
Change PRF (Pulse Repetition Frequency)
Adjusts the repetition rate of the Doppler pulses
transmitted to acquire the data for color flow mapping.
The PRF (Nyquist limit) should be adjusted so that no
aliasing occur, while still having a good resolution of
velocities, meaning the Nyquist limit should be
somewhat above the maximum velocity found in the
data.
4.
Adjust LVR (Low Velocity Rejection
LVR, also called Wall Motion Filter, enables the extent
of low velocity removal to be adjusted.
5.
Invert
Enables the color scheme assigned to positive and
negative velocities to be inverted.
Invert is available in live and Cine Replay.
Summary of Contents for Vivid 7
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