Which transducer arrangement is curved?

• A. Phased array
• B. Linear array
• C. Mechanical sector
• D. Curved array

Answer: (D)

The main idea is the physical shape of the active element layout. In a curved array, the transducer elements are arranged along a curved surface, so each element radiates at a slightly different angle along that arc. When the beam is sent into the body, the combination of these angled emissions produces a curved, fan-shaped field on the image. That curved, arc-shaped aperture is what defines the arrangement as curved.

Phased and linear arrays use flat apertures—their beams are steered electronically or shaped by a straight row of elements, resulting in flat or rectangular fields rather than a curved one. A mechanical sector uses a single, physically curved element and sweeps it mechanically, which also creates a sector field, but it’s not an array of multiple curved elements like the curved array.