GE HealthCare CONFIDENTIAL
Direction
5936427
, Rev. 1
LOGIQ Totus
Basic Service Manual
Chapter 4 Functional Checks
4 - 23
4-3-14
PW/CW Doppler mode functional checks
For information on the Ultrasound system’s different modes, the Basic User Manual will familiarize you
with image optimization for
B-Mode
,
M-Mode
,
Color Flow
, and
Doppler
.
Doppler is used to measure velocity (most often in blood). Doppler mode can be done with a special
pencil probe or with an ordinary probe. By using an ordinary probe, you can first bring up a B-Mode
picture for navigation purpose and then add Doppler.
Preparations
1.) Connect one of the probes to the scanner.
2.) Turn ON the scanner.
3.) The 2D Mode window is displayed (default mode).
4.) If needed, adjust the display’s Brightness and Contrast setting.
5.) Press
PW
or
CW
to start Pulsed Wave Doppler (PW) or Continuous Wave Doppler (CW).
6.) Use the Trackball to select the Area of Interest (Sample Volume) in PW or direction of interest in
CW.
To adjust the PW/CW Doppler Mode controls
:
Adjust the
Active mode gain
to set the gain in the spectral Doppler area.
•
Adjust
Low velocity reject
to reduce unwanted low velocity blood flow and tissue movement.
•
In PW mode, adjust
Sample volume
to low setting for better resolution, or higher setting to more
easily locate the disturbed flows.
•
Adjust the
Compress
setting to balance the effect of stronger and weaker echoes and obtain the
desired intensity display.
•
Adjust
Frequency
to optimize flow display. Higher setting will improve resolution and the lower
setting will increase the depth penetration.
•
Adjust
Frame rate
to a higher setting to improve motion detection, or to a lower setting to improve
resolution.
NOTE:
Frequency and Frame rate settings may affect the Low Velocity Reject.
•
Adjust
Power
to obtain an acceptable image using the lowest setting possible. This is particularly
important in CW-mode, as the energy duty cycle is 100% (constant).
NOTE:
The Doppler Power setting affects only Doppler operating modes.
•
Adjust the following settings to further optimize the display of the image.
•
Use the
Horizontal sweep
to optimize the sweep speed.
•
To view signal detail, adjust
Scale
to enlarge the vertical spectral Doppler trace.
•
Use
Invert
to reverse the vertical component of the spectral Doppler area of the display.
•
Use
Angle correction
to steer the ultrasound beam to the blood flow to be measured.
Summary of Contents for LOGIQ Totus
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