Which control would you adjust to alter the dynamic range of the displayed echoes?

Which control would you adjust to alter the dynamic range of the displayed echoes?

• A. Time gain compensation
• B. Scanning depth
• C. Compression
• D. Transmit power

Answer: (C)

Dynamic range on the screen is controlled by how the system maps echo amplitudes to grayscale. Compression is the process that scales those amplitudes before display, determining how many gray shades are used and how bright each echo appears. By adjusting compression, you change the displayed dynamic range: increasing compression narrows the range and makes the image higher in contrast, while decreasing compression broadens the range and reveals more subtle differences. This directly alters how wide a range of echoes can be represented on the display. The other controls don’t change the mapping of amplitudes to grayscale: time gain compensation fixes brightness with depth, scanning depth changes how deep you’re looking, and transmit power changes the emitted signal’s strength rather than the display’s gray-scale mapping.

Dynamic range on the screen is controlled by how the system maps echo amplitudes to grayscale. Compression is the process that scales those amplitudes before display, determining how many gray shades are used and how bright each echo appears. By adjusting compression, you change the displayed dynamic range: increasing compression narrows the range and makes the image higher in contrast, while decreasing compression broadens the range and reveals more subtle differences. This directly alters how wide a range of echoes can be represented on the display. The other controls don’t change the mapping of amplitudes to grayscale: time gain compensation fixes brightness with depth, scanning depth changes how deep you’re looking, and transmit power changes the emitted signal’s strength rather than the display’s gray-scale mapping.