B-K Medical Pro Focus 2202, User Manual

Page: 121 / 356

B-Mode – 2D Imaging 121
B-Mode Gain
The
[
B Gain/Cine
]
dial determines the overall amplification that is applied to
ultrasound echoes from all depths.
To adjust the overall gain:
•
Turn the
[
B Gain/Cine
]
dial.
or
• Click Gain under General on the left side of the screen and drag the slider (or
point at Gain and press
[
+/-
]
).
The current overall gain setting (a percentage) is displayed on the screen next to
Gain.
TGC
The TGC curve determines variable amplification applied to echoes from different
depths in the tissue. The TGC function compensates for attenuation and scattering of
the ultrasound beam in the tissue.
When you select a transducer, if all TGC sliders are in the center position, scanning
starts using a default TGC curve optimized for the transducer. (The default is either
the one set at the factory or one you have set up yourself. See Chapter 13, “Setting
Up and Customizing Your System”.)
The
[
TGC
]
sliders adjust the relative gain of the image at different tissue depths.
Each slider adjusts a specific part (1/8th) of the TGC curve; the topmost control
adjusts the top 1/8th of the image.
NOTE:
The sliders operate relative to their center position; when they are all
centered, the default TGC is used.
To adjust the TGC curve:
• Move the
[
TGC
]
sliders to the right or left to adjust the TGC curve.
The shape of the TGC curve is temporarily displayed to the right of the image
as a curved vertical line. This indicates the modification that is applied to the
default TGC curve.
NOTE
: The TGC curve operates on the screen image, not on the ultrasound
echo. Thus if you move or resize the image, you may have to readjust the TGC
curve.
360°
transducers
NOTE: With 360° transducers, the top slider adjusts the part of the image that
is most central – that is, closest to the transducer.