Terason t3000, Руководство пользователя

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Chapter 5 - Working With Scan Modes Scan Modes Overview
Terason t3000 / Echo Ultrasound System User Guide 96
Adjusting gain may brighten or darken the image if sufficient echo information is
generated. When you adjust the gain, the Terason software increases or decreases the
overall gain while maintaining the shape of the TGC curve. See
Adjusting Time Gain
Compensation on page 96 for more information on TGC settings.
When you select an exam type, the Terason software sets the gain to a preset value for the
specific exam type, transducer, and patient size.
To decrease the gain, click the slider and drag it to the left. To increase the gain, click the
slider and drag it to the right.
Changing the Gain
You can also adjust the gain by clicking in the 2D window and pressing the left (to
decrease gain) and right (to increase gain) arrow keys. Or you can use the Image menu to
move the gain one setting higher (
Image > Gain > Up
) or one setting lower (
Image > Gain >
Down
).
Changing the Gain from the Image Menu
When you adjust the gain setting, the Terason software automatically adjusts the Time
Gain Compensation curve to support the new gain setting.
Adjusting Time Gain Compensation
Scanning tissues at increasing depths causes attenuation of the returned signal. The TGC
sliders adjust amplification of returning signals to correct for the attenuation. TGC
balances the image to equalize the brightness of echoes from near field to far field.
The Terason software rescales the TGC settings when you do any of the following:
• Change the depth
• Load a new exam type
• Select a different patient size
• Adjust the gain setting
The TGC slider bar spacing is proportional to the depth. The TGC curve on the image
display represents the TGC settings.