152
Accutome B-Scan Plus User Guide
TGC
Adjustment
TGC (Time Gain Compensation) feature provides for
segmental adjustment throughout the entire range of the
probe’s sonic echo. For example, the echo nearest to
the probe’s transducer might be selectively reduced to
better distinguish tissue within the anterior segment,
while at the same time the echo from the retina and orbit
might be selectively amplified in order to achieve a well
balanced image having optimum brightness throughout
the length of the eye. Alternately, the clinician may use
TGC to selectively amplify only the Vitreous echoes or
only the Anterior Chamber echoes. This feature
provides unparalleled control of image quality and thus
diagnostic quality.
The TCG settings can be adjusted to facilitate viewing
cert
ain areas of the eye, by increasing the gain for that
portion of the signal with a specific TGC setting. There
are three adjustable TGC settings:
1. Nea
r - increases the gain for the anterior portion of
the eye in the B-Scan Plus image, near the probe
2. Mid -
increases the gain for the middle portion of
the eye
3. Far -
increases the gain for the far portion of the
eye
How to Adjust the TGC
The TGC adjustments (see Figure 118 on page 153) on
both the Exam and Analyze Screen are easy to use.
The adjustments are graphical slide indicators that be
dragged to increase and decrease the signal gain for a
selected portion of the image.
1. Selec
t the TGC tab from the tools palette.
2. T
o adjust the gain slide the appropriate setting indi-
cators.
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