What is the name of the receiver function that corrects for attenuation?

• A. Compensation
• B. Amplification
• C. Compression
• D. Demodulation

Answer: (A)

Attenuation causes deeper echoes to grow weaker as sound travels through tissue. The receiver uses a depth-dependent gain called compensation to counteract this loss, typically implemented as time-gain compensation (TGC). By increasing amplification with depth, the brightness of deep echoes matches that of shallow echoes, making the image more uniform.

Amplification would raise all signals equally, not address depth-related loss. Compression changes the dynamic range of the signal, not how the signal grows with depth. Demodulation is the envelope-detection step, not a fix for attenuation.