Which method increases amplification applied to echoes from deeper structures to account for attenuation?

Which method increases amplification applied to echoes from deeper structures to account for attenuation?

• A. TGC
• B. Overall receiver gain
• C. Dynamic range
• D. Transmit power

Answer: (A)

Time Gain Compensation is used to counteract attenuation by depth. As ultrasound waves travel through tissue, deeper echoes fade because of absorption and scattering. TGC applies more amplification to later-arriving echoes (which come from deeper structures) than to early ones, effectively equalizing brightness across depths. This depth-dependent gain profile is adjustable, so sonographers can tailor the curve to the patient and exam. In contrast, overall receiver gain would affect all echoes equally, dynamic range controls the display range of intensities, and transmit power changes the emitted energy but doesn’t selectively compensate for depth-related attenuation.

Time Gain Compensation is used to counteract attenuation by depth. As ultrasound waves travel through tissue, deeper echoes fade because of absorption and scattering. TGC applies more amplification to later-arriving echoes (which come from deeper structures) than to early ones, effectively equalizing brightness across depths. This depth-dependent gain profile is adjustable, so sonographers can tailor the curve to the patient and exam. In contrast, overall receiver gain would affect all echoes equally, dynamic range controls the display range of intensities, and transmit power changes the emitted energy but doesn’t selectively compensate for depth-related attenuation.