Service manual

GE MEDICAL SYSTEMS
D
IRECTION 2300749-100, REVISION 2LOGIQ
TM
3 SERVICE MANUAL
Chapter 4 4-13
4-4-2-2 B Mode OP Panel Controls
Table 4-4 B Mode Control Panel Controls
Step Task Expected Result(s)
1
Press B Mode key B Mode Starts
2
Adjust Depth
Adjust the field of view. Increasing the depth
may view larger/deeper structures rates, and
decreasing the depth may view near the skin
line.Turn Depth right/left to increase/
decrease. Depth displays on the monitor in
cm.
3
Adjust Gain
Controls the amount of echo information
displayed in an image. Turn B Mode dial to
the left/right to increase/decrease Gain. Gain
displays on the monitor in G (dB).
4
Adjust Time Gain Compensation (TGC)
Amplifies the returning signals to correct for
the attenuation caused by tissues at
increasing depth. TGC slide pots spaced
proportional to the depth. Move the slide pots
to the left/right to decrease/increase TGC. A
TGC curve appears on the display.
5
Adjust Scan Area
Widen or narrow the size of the sector angle
to maximize the image’s region of interest
(ROI). Press Scan Area and move the
Trackball to narrow/widen the angle.
6
Activate Auto Optimize
Optimize the image based upon a specified
region of interest or anatomy. Press the right
Auto control to activate.
7
Adjust Zoom
Changes the location of the focal point(s). A
triangular focus marker indicates the depth of
the focal point.
8
Reverse
Toggles the left/right orientation of the scan
image.
9
Harmonics (Activate Tissue Harmonics)
Diminishes low frequency high amplitude
noise and improves imaging. Enhances near
field resolution for improved small parts
imaging as well as far field penetration. Press
Harmonics Key to activate.