Which mode is described as displaying a line of dots with varying brightness?

Which mode is described as displaying a line of dots with varying brightness?

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

Answer: (B)

In ultrasound imaging, the way echoes are displayed matters for interpreting tissue structure. The description of a line made up of dots whose brightness varies as the echoes change is characteristic of B-mode, or brightness mode. Each scan line is broken into many tiny picture elements (dots), and the brightness of each dot corresponds to the strength of the echo from that depth. Strong reflections (like bone or strong tissue interfaces) appear bright, while weaker echoes appear darker. As the transducer sweeps across the area, many lines of dots come together to form a two-dimensional grayscale image. This contrasts with A-mode, which shows a single depth profile with spikes, and with D-mode or C-mode, which are used for Doppler information or other specialized representations.

In ultrasound imaging, the way echoes are displayed matters for interpreting tissue structure. The description of a line made up of dots whose brightness varies as the echoes change is characteristic of B-mode, or brightness mode. Each scan line is broken into many tiny picture elements (dots), and the brightness of each dot corresponds to the strength of the echo from that depth. Strong reflections (like bone or strong tissue interfaces) appear bright, while weaker echoes appear darker. As the transducer sweeps across the area, many lines of dots come together to form a two-dimensional grayscale image. This contrasts with A-mode, which shows a single depth profile with spikes, and with D-mode or C-mode, which are used for Doppler information or other specialized representations.