Which control selectively brightens deep echoes relative to shallow echoes?

Which control selectively brightens deep echoes relative to shallow echoes?

• A. TGC
• B. Master gain
• C. Dynamic range
• D. Reject

Answer: (A)

The main idea is depth-dependent gain compensation in ultrasound. As sound travels deeper, echoes weaken due to attenuation, so increasing gain with depth helps keep deep structures visible. This selective brightening of deep echoes is done by time-gain compensation, which adjusts amplification as a function of depth to counteract the natural loss of signal. That’s why the deep echoes appear brighter relative to shallow ones. The reason this is the best choice is that time-gain compensation specifically targets depth, altering gain gradually as depth increases, whereas other controls don’t. Master gain applies a single, overall amplification to all echoes, so it doesn’t preferentially brighten deep signals. Dynamic range sets how many gray shades appear in the image, not how brightness changes with depth. Reject removes low-amplitude signals or artifacts, not deeper signals selectively. So, selective brightening of deep echoes relative to shallow echoes is achieved by time-gain compensation.

The main idea is depth-dependent gain compensation in ultrasound. As sound travels deeper, echoes weaken due to attenuation, so increasing gain with depth helps keep deep structures visible. This selective brightening of deep echoes is done by time-gain compensation, which adjusts amplification as a function of depth to counteract the natural loss of signal. That’s why the deep echoes appear brighter relative to shallow ones.

The reason this is the best choice is that time-gain compensation specifically targets depth, altering gain gradually as depth increases, whereas other controls don’t. Master gain applies a single, overall amplification to all echoes, so it doesn’t preferentially brighten deep signals. Dynamic range sets how many gray shades appear in the image, not how brightness changes with depth. Reject removes low-amplitude signals or artifacts, not deeper signals selectively.

So, selective brightening of deep echoes relative to shallow echoes is achieved by time-gain compensation.