Which presentation uses a horizontal baseline indicating distance or time, with a vertical deflection indicating the amplitude of the returning signal?

Which presentation uses a horizontal baseline indicating distance or time, with a vertical deflection indicating the amplitude of the returning signal?

• A. B-scan presentation
• B. C-scan presentation
• C. D-scan presentation
• D. A-scan presentation

Answer: (D)

This is the A-scan presentation. In an A-scan, the horizontal axis represents time (or the corresponding distance to a reflector), and the vertical axis shows the amplitude of each returning ultrasonic signal. The time-of-flight tells you how deep the reflector is, while the height of each peak indicates how strong the echo is. The other displays arrange echoes differently into 2D images or plan views, but the described setup—baseline along time/distance with vertical amplitude spikes—specifically matches the A-scan.

This is the A-scan presentation. In an A-scan, the horizontal axis represents time (or the corresponding distance to a reflector), and the vertical axis shows the amplitude of each returning ultrasonic signal. The time-of-flight tells you how deep the reflector is, while the height of each peak indicates how strong the echo is. The other displays arrange echoes differently into 2D images or plan views, but the described setup—baseline along time/distance with vertical amplitude spikes—specifically matches the A-scan.