GE LOGIQ 7, Основное руководство пользователя

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Optimizing the Image
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104 LOGIQ 7 Online Help
Direction 2392536-100 Rev. 1
Dynamic Range
Description Dynamic range controls how echo intensities are converted to
shades of gray, thereby increasing the range of contrast you can
adjust.
Adjusting You access Doppler dynamic range from the Doppler Mode
Touch Panel. Each click cycles you to the next setting. To
increase/decrease, press
Dynamic Range .
Values The settings cycle in 4 dB increments. The current value
displays on the Touch Panel. Dynamic Range values vary by
probe and application and are returned to the factory or user
preset value when you change the following: Probe, Exam
Category, Exam Calcs, or New Patient.
Benefits Optimizes the image's texture and smoothness by increasing
the amount of gray scale. You decrease the dynamic range to
clean out the spectrum to determine if the broadening is actual
or not. You increase the dynamic range to fill in the spectrum,
according to your personal preference.
Affect on other
controls Dynamic range operates only in realtime, not in freeze, CINE,
CINE Timeline, or VCR playback and affects Doppler gain.
Spectral Trace (Trace Method)
Description Traces the average mean and peak velocities in realtime images
and spectral broadening in frozen images.
Adjusting Select the spectral trace method from Trace Method .
To activate the Spectral Trace Touch Panel, press
To get a peak trace, click MAX TRACE. A green trace displays
on the spectrum.
To get a mean trace, click MEAN TRACE. A blue trace displays
on the spectrum.
Selecting Trace
Position SELECT TRACE lets you indicate whether cardiac cycle
detection, and therefore cardiac cycle identification, should use
peak timeline data above, below, or above and below
(composite) the baseline.
Benefits Broadening may indicate turbulence.