GE LOGIQ 7, Basic User Manual

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Optimizing B-Mode
LOGIQ 7 Online Help 5
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7
Direction 2392536-100 Rev. 1
Gain
Description B-Mode Gain increases or decreases the amount of echo
information displayed in an image. It may have the effect of
brightening or darkening the image if sufficient echo information
is generated.
Adjusting Gain values vary depending on the probe; they are not
associated with a particular position of the knob.
NOTE: TruAccess allows you to change the gain on a frozen image.
B-Mode gain is independent of M-Mode and Doppler and Color
Flow Gain. Changing the gain while in M-Mode does not affect
the B-Mode image gain.
To decrease/increase, rotate Gain .
Values Gain displays on the monitor in Gn (dB). Gain increments by 2
dB. Maximum gain varies by probe. The current gain value is
displayed. Gain values vary by probe, application, and
frequency setting.
NOTE: Maximum gain is factory preset to an optimum setting to
eliminate noise in the display.
Gain values are returned to the factory or user preset value
when you change the following: Probe, Exam Category/Exam
Calc, New Patient, or Frequency.
Benefits Gain allows you to balance echo contrast so that cystic
structures appear echo-free and reflecting tissue fills in.
Affect on other
controls After you adjust the Power Output, you may need to adjust the
gain. Generally speaking, if you increase the Power Output, you
need to decrease the gain; if you decrease the Power Output,
you need to increase the gain. Gain and TGC interact by adding
together.
Bioeffects Gain has no affect on Power Output. However, with increased
gain, the power output level can usually be reduced to produce
an equivalent image quality.
NOTE: Always optimize gain before increasing the Power Output.