GE H
EALTHCARE
D
IRECTION
FC091194, R
EVISION
11
V
IVID
7 S
ERVICE
M
ANUAL
Chapter 4 - Functional Checks
4 - 51
4-3-9-3
Check Horizontal Sweep, Velocity Range, Baseline and Low Velocity Reject
Table 4-19 Doppler Mode Controls Checks
Step
Task
Expected Result(s)
1.
Adjust
HORIZONTAL SWEEP
Adjusts the horizontal refresh rate of the Doppler area
of the display.
Horizontal sweep is available in live and cine replay.
2.
Adjust
VELOCITY RANGE
Enables the vertical scale of the Doppler spectrum and
the maximal detectable velocity to be modified.
Velocity range directly controls the pulse repetition
frequency, which is responsible for the setting of the
Nyquist limit (the ability to detect maximal velocity
without aliasing).
3.
Move
BASELINE
Enables the Doppler baseline to be shifted up and
down.
The default Doppler baseline is set at the center of the
vertical aspect of the Doppler display, dividing evenly
the flow toward and away from the probe.
By adjusting the baseline a larger portion of the analysis
is assigned to the flow direction present.
Baseline is available in live and cine replay.
4.
Adjust Low Velocity Reject (
LV REJ
.)
Enables the low velocity portions of the spectrum to be
filtered, since the Doppler spectrum and audio may
contain strong wall-motion signals.
The amount of LV Rej. is indicated by the green vertical
bar at the right end of the baseline.
Summary of Contents for Vivid 7
Page 1: ...GE Healthcare Operating Documentation Vivid 7 Service Manual Part Number FC091194 Revision 11...
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Page 38: ...GE HEALTHCARE DIRECTION FC091194 REVISION 11 VIVID 7 SERVICE MANUAL xxxvi...
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