Which imaging mode demonstrates length, width, and thickness and provides a 2D display of a 3D volume?

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

Answer: (C)

Volumetric scanning captures a true 3D dataset, so you can see and measure along three dimensions: length, width, and thickness. From that volume, you can view 2D slices in different planes or generate 3D renderings, giving a 2D representation of a 3D structure when needed. Traditional B-mode provides a single 2D plane at a time, so it doesn’t inherently convey depth as a separate dimension. M-mode follows motion along a single line over time, not a volume, and Doppler mode focuses on velocity rather than anatomy. The ability to acquire a 3D volume and then display 2D slices from it is what makes volumetric scanning the correct choice.