Which UT display provides a two-dimensional cross-section of the inspected area?

• A. A-scan
• B. B-scan
• C. C-scan
• D. D-scan

Answer: (B)

Two-dimensional cross-section imaging comes from the display that builds an image by combining depth information as the probe moves along the area. Depth is shown on one axis and the scan position along the inspected line on the other, so you see a slice through the material with reflections from boundaries or flaws at their actual depths and lateral positions. A single depth trace from one location gives just a line, not a cross-section; a plan-view display shows a map of features at a fixed depth rather than a slice, and other modes focus on depth information from one line rather than a full cross-sectional view.