Which display format appears as a series of upward spikes?

Which display format appears as a series of upward spikes?

• A. A-mode
• B. B-mode
• C. M-mode
• D. Doppler mode

Answer: (A)

A-mode is a one-dimensional display that converts each echo into a vertical spike at the depth where it arrives. The horizontal axis represents depth, and the height of each spike corresponds to the echo strength. As reflectors are encountered along the depth, you see a series of upward spikes along the baseline. This is different from B-mode, which creates a grayscale 2D image; M-mode, which shows motion over time along a single line; and Doppler mode, which displays frequency shifts or velocity information rather than spikes.

A-mode is a one-dimensional display that converts each echo into a vertical spike at the depth where it arrives. The horizontal axis represents depth, and the height of each spike corresponds to the echo strength. As reflectors are encountered along the depth, you see a series of upward spikes along the baseline. This is different from B-mode, which creates a grayscale 2D image; M-mode, which shows motion over time along a single line; and Doppler mode, which displays frequency shifts or velocity information rather than spikes.