Which term describes the process of adjusting gain with depth to compensate for attenuation during reception?

Which term describes the process of adjusting gain with depth to compensate for attenuation during reception?

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

Answer: (A)

Time Gain Compensation is the process of adjusting gain with depth to compensate for attenuation during reception. As the ultrasound wave travels through tissue, echoes from deeper structures weaken due to absorption and scattering. TGC increases the receiver gain as time progresses (which maps to greater depth) so those deeper echoes are amplified more, helping to produce a consistent brightness along the image. This adjustment is done in the receiver before display. By contrast, amplification is a single overall gain applied to all echoes, demodulation converts the RF signal to an analog or digital form for processing, and compression changes the dynamic range of the signal rather than depth-dependent gain.

Time Gain Compensation is the process of adjusting gain with depth to compensate for attenuation during reception. As the ultrasound wave travels through tissue, echoes from deeper structures weaken due to absorption and scattering. TGC increases the receiver gain as time progresses (which maps to greater depth) so those deeper echoes are amplified more, helping to produce a consistent brightness along the image. This adjustment is done in the receiver before display. By contrast, amplification is a single overall gain applied to all echoes, demodulation converts the RF signal to an analog or digital form for processing, and compression changes the dynamic range of the signal rather than depth-dependent gain.