Applying voltage pulses to all elements in the array as a group, but with minor time difference, enabling multiple focal zones, beam steering and beam focusing is described by which term?

• A. Phased
• B. Sequenced array
• C. Continuous wave
• D. Doppler mode

Answer: (A)

Beaming ultrasound with a phased array relies on precise timing of each element’s excitation so the emitted waves combine constructively at the desired point. By applying pulses to all elements as a group but with tiny time differences, the wavefront is shaped into a converging pattern that focuses at a chosen depth. Adjusting those delays lets you steer the beam electronically and create multiple focal zones along the path, all without moving the transducer. The other terms don’t fit because continuous wave uses a steady frequency without driven delays for focusing, a sequenced array would imply firing groups in order rather than applying synchronized delays, and Doppler mode measures motion via frequency shifts rather than forming and steering the beam.