Which statement correctly describes array transducers compared to single-element transducers?

• A. They can only focus mechanically
• B. They enable electronic focusing and steering
• C. They have lower dynamic range
• D. They cannot form multiple scan lines

Answer: (B)

Array transducers use many small elements, and by applying precise time delays across those elements, the system can shape the emitted wavefront so it focuses at a chosen point and points in chosen directions. This means you can electronically focus at different depths (electronic focusing) and steer the beam to look in different angles without moving the transducer (electronic steering). That real-time control is the key advantage over a single-element transducer, which relies on fixed focal properties or mechanical movement to change focus or direction. Because of this electronic capability, array transducers are also able to form multiple scan lines and views simultaneously or rapidly switch between them, which isn’t possible with a single-element device.