Which mode is used to measure dimensions and yields a tracing-like display?

Which mode is used to measure dimensions and yields a tracing-like display?

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

Answer: (B)

M-mode is the mode that yields a tracing-like display and is used to measure dimensions. It presents a single ultrasound line over time, so the position of structures is plotted as they move, creating a one-dimensional trace that you can read off to determine distances and changes in size, such as cardiac chamber dimensions or wall motion. This time-based trace makes precise measurement of motion and dimensions possible. In contrast, B-mode gives a two-dimensional grayscale image of anatomy, A-mode shows depth with a vertical spike display, and duplex combines B-mode imaging with Doppler flow information, none of which centers on a tracing over time for measuring dimensions.

M-mode is the mode that yields a tracing-like display and is used to measure dimensions. It presents a single ultrasound line over time, so the position of structures is plotted as they move, creating a one-dimensional trace that you can read off to determine distances and changes in size, such as cardiac chamber dimensions or wall motion. This time-based trace makes precise measurement of motion and dimensions possible. In contrast, B-mode gives a two-dimensional grayscale image of anatomy, A-mode shows depth with a vertical spike display, and duplex combines B-mode imaging with Doppler flow information, none of which centers on a tracing over time for measuring dimensions.