An array transducer where the active elements are arranged in a bowed or arched line.

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

Answer: (B)

The arrangement described—the active elements lying along a bowed or arched line—defines a convex (curved) array. In ultrasound, the shape of the aperture directly shapes the emitted beam and the scan field. A linear array has elements in a straight line, producing a linear, rectangular footprint. An annular array uses concentric rings and focuses in the elevation plane differently. A phased array is typically a flat panel with electronic delays to steer and focus, without a fixed curved arc. The curved, bowed arrangement specifically results in a convex (curved) array, which provides a broader, curved field of view well-suited to conforming to curved surfaces.