A sector display that narrows to a point at the transducer surface most likely used which transducer type?

• A. Linear array
• B. Phased array
• C. Curved array
• D. Annular array

Answer: (B)

A sector display that narrows to a point at the transducer surface points to electronic beam steering from a small, shared origin on the probe. That is the hallmark of a phased array transducer. By applying precise timing delays across many tiny elements, the beam can be steered and focused to create a fan-shaped (sector) image with an apex at the transducer. The other transducer types produce different image geometries: a linear array gives a rectangular field with parallel scan lines, a curved (convex) array yields a broader, curved sector tied to its curved footprint, and an annular array uses concentric rings for focusing with a different beam pattern. The distinct sector shape with a single apex at the surface best matches a phased array.