Which transducer arrangement uses electronic focusing and electronic steering to shape the beam?

• A. Linear Phased Array
• B. Convex Sequential Array
• C. Linear Sequenced Array
• D. CW Transducers

Answer: (A)

Electronic focusing and steering come from phased array beamforming. In a linear phased array, many small elements are lined up, and each element is driven with a carefully timed pulse. By applying progressive time delays across the elements, the arriving waves add up to form a beam that points in a chosen direction (steering) and converges at a specific depth (focusing). This entire process is done electronically, without moving the transducer.

Other transducer designs rely more on fixed delays, group activation, or mechanical movement, so they don’t provide the same flexible electronic steering and focusing capability. Continuous-wave transducers, while useful for Doppler, don’t produce the depth-resolved imaging that requires this type of beam shaping.