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Doppler
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
5–71
PW Doppler Mode Sub-Menu Page 4 (cont’d)
Trace Method
Dynamic Range
Description
Choose which method is used to trace
the Doppler waveform in realtime. (Also
found in the CWD soft menu.)
Controls how echo intensities are
converted to shades of gray, thereby
creating a range of gray scale that can be
adjusted. (Also found in the CWD soft
menu.)
Benefits
Front panel access through the VFD to
change trace method.
Useful for optimizing tissue texture to
differentiate between echo levels that are
close together. Dynamic range should be
adjusted so that the highest amplitude
edges appear as white while lowest
levels (such as blood) are just visible.
Values
Select the default parameter to be traced
in the Set Up/Custom Display menu
page 15.
Peak
Peak or highest values
Floor
Bottom or lowest values and
peak
Mean
Average values and peak
Mode
Brightest echo trace and peak
The settings cycle in 6 dB steps from
18 dB to 48 dB. Set the default value for
PWD dynamic range in the Set
Up/Custom Display menu page 4.
Dynamic range levels are returned to the
preset value when changing the
following:
Application
Exam category
New patient.
Pre-processing function.
Affects on
Other Controls
Operates only in real-time, not in freeze,
Cine, Timeline replay, or VCR playback.
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