GE HEALTHCARE PROPRIETARY TO GE
D
IRECTION 5394227, 12 LOGIQ S8/LOGIQ E8 SERVICE MANUAL
4 - 30 Section 4-4 - Functional Checks
4-4-9-2 Adjust the PW/CW Doppler Mode controls
• Adjust the Gain to set the gain in the spectral Doppler area.
•Adjust Wall Filter 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 Compression 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.
•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.
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