Dynamic range in ultrasound describes which of the following?

• A. The range of echo amplitudes that can be displayed
• B. The range of imaging depths
• C. The range of transducer frequencies
• D. The range of probe motion

Answer: (A)

Dynamic range is about how much variation in echo strength the display can represent. Echo amplitudes from tissue span a wide range, and the ultrasound system maps those signals into a limited set of grayscale shades. A wide dynamic range means many grayscale levels, so subtle differences in echo brightness are visible. A narrower dynamic range increases contrast but can cause weaker echoes to fade away. This concept is usually described in decibels, as the ratio between the strongest and weakest echoes the system can display without saturation. It doesn’t describe depth, transducer frequency, or probe motion, which relate to penetration, resolution, and movement rather than the range of displayable echo intensities.