One-dimensional quantitative images using a single sound beam. Y axis—amplitude of returning echo; X axis—distance.

One-dimensional quantitative images using a single sound beam. Y axis—amplitude of returning echo; X axis—distance.

• A. A-Mode
• B. B-Mode
• C. M-Mode
• D. C-Mode

Answer: (A)

A-mode displays a one-dimensional plot of echo amplitude versus depth from a single sound beam. In this mode, the transducer sends one line of ultrasound and the returning echoes are plotted with distance along the horizontal axis and the echo strength on the vertical axis. Each reflector along the beam produces a spike whose height corresponds to the amplitude of the returning echo. Because it uses just a single beam and presents information along that line only, the image is one-dimensional. B-mode, by contrast, builds a two-dimensional grayscale image by scanning across multiple lines to create a map of reflectivity. M-mode shows motion over time along a single line. C-mode is not the described format for this scenario.

A-mode displays a one-dimensional plot of echo amplitude versus depth from a single sound beam. In this mode, the transducer sends one line of ultrasound and the returning echoes are plotted with distance along the horizontal axis and the echo strength on the vertical axis. Each reflector along the beam produces a spike whose height corresponds to the amplitude of the returning echo. Because it uses just a single beam and presents information along that line only, the image is one-dimensional.

B-mode, by contrast, builds a two-dimensional grayscale image by scanning across multiple lines to create a map of reflectivity. M-mode shows motion over time along a single line. C-mode is not the described format for this scenario.