SAEVO EVUS 8, Руководство пользователя

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6 Acquiring Images
56 Basic User Manual
6�2�2 Optimizing B-Mode Images
After entering the B mode, the imaging parameters display at the bottom of the LCD monitor as shown in
Figure 6-4, you can use them to optimize B-mode images.
You can adjust other parameters and select display modes on the pop-up menu by selecting the
Menu key.
NOTE:
You can adjust all parameters in the real time B mode, but can only adjust
Chroma
and
GSC
in the frozen B
mode.
■ Gain
The B mode gain (2D gain) determines the amplifying factors for the received echoes and the brightness of the
ultrasound image. The echoes are amplified with the same gain value regardless of depth.
To adjust the gain:
● Rotate the
B
knob clockwise to increase the value.
● Rotate the B knob anticlockwise to decrease the value.
■ TGC
TGC (Time Gain Compensation) is used to adjust the gain that allows compensation for attenuation of the echoes
over time (depth). It is adjustable during the real time scan regardless of the imaging mode and display format.
TGC balances the image so that the density of echoes is the same throughout the image.
To adjust TGC:
●
Move the desired TGC slider left to decrease the value.
●
Move the desired TGC slider right to increase the value.
NOTE :
• Modifications of TGC values cannot be saved if you shift to use another imaging mode.
• The TGC curve is displayed in the top right corner of the imaging area when you adjust TGC values, and
the curve disappears if TGC values are not adjusted for more than 3 seconds.
■ LGC
LGC is used to adjust the brightness on the left or right part of the ultrasound image.
To adjust LGC:
1. Select the
Menu key in the real time scan. A menu pops up on the screen.
2. Select LGC Left or LGC Right by using the trackball or the ↑ or ↓ key.
3. Rotate the
Menu
key or select the ← or → key to adjust the value.
■ Focal Position/Number/Span
It is used to adjust the depth range of the ultrasound beam, the focus number and the focal span. The focus
identified by a red triangle displays on the right side of the image.
Focus optimizes the image by increasing the resolution for a specific area.
To adjust the focal position/number/span:
●
Flip the FOCUS switch to adjust the depth of focal zone(s).
●
Select Foc�Num by pressing the corresponding function key, and rotate it to adjust the value.
● If two or more focuses are displayed, select
Foc�Span
by pressing the corresponding function key, and rotate it
to adjust the value.