Which control adjusts the amplification of all reflected signals, not just those at a specific depth?

Which control adjusts the amplification of all reflected signals, not just those at a specific depth?

• A. System shielding
• B. Master gain
• C. TGC
• D. Dynamic range

Answer: (B)

The main idea being tested is uniform amplification of all echoes. Master gain sets the overall amplification of the received signal, applying the same boost to every depth and every reflector. This makes the entire image brighter or darker without favoring any particular depth. Time-gain compensation, by contrast, adjusts amplification with depth to compensate for attenuation, so it affects deeper echoes more than shallower ones. Dynamic range controls how many gray shades are displayed, not how loudly echoes are amplified. System shielding isn’t a standard imaging control for changing echo brightness. Therefore, the master gain is the control that increases amplification of all reflected signals equally across the depth.

The main idea being tested is uniform amplification of all echoes. Master gain sets the overall amplification of the received signal, applying the same boost to every depth and every reflector. This makes the entire image brighter or darker without favoring any particular depth. Time-gain compensation, by contrast, adjusts amplification with depth to compensate for attenuation, so it affects deeper echoes more than shallower ones. Dynamic range controls how many gray shades are displayed, not how loudly echoes are amplified. System shielding isn’t a standard imaging control for changing echo brightness. Therefore, the master gain is the control that increases amplification of all reflected signals equally across the depth.