Time gain compensation is used to compensate for depth-related attenuation by increasing gain with depth. Which option reflects this concept?

Time gain compensation is used to compensate for depth-related attenuation by increasing gain with depth. Which option reflects this concept?

• A. Uniform gain
• B. Increase gain with depth
• C. Decrease gain with depth
• D. Random

Answer: (B)

Time gain compensation is all about keeping echoes from different depths at similar brightness by boosting deeper echoes more. As ultrasound waves travel deeper, they lose energy and the returning signals weaken. To counteract this, the receiver applies more gain to later-arriving echoes, effectively increasing gain with time and depth. That increasing gain with depth best matches how TGC works. Uniform gain wouldn’t offset depth-related loss, so deeper structures would look dimmer; decreasing gain with depth would make the problem worse; a random setting wouldn’t provide a systematic correction.

Time gain compensation is all about keeping echoes from different depths at similar brightness by boosting deeper echoes more. As ultrasound waves travel deeper, they lose energy and the returning signals weaken. To counteract this, the receiver applies more gain to later-arriving echoes, effectively increasing gain with time and depth. That increasing gain with depth best matches how TGC works. Uniform gain wouldn’t offset depth-related loss, so deeper structures would look dimmer; decreasing gain with depth would make the problem worse; a random setting wouldn’t provide a systematic correction.