Transmit focusing is achieved with a curved pattern phased excitation of the active elements.

Transmit focusing is achieved with a curved pattern phased excitation of the active elements.

• A. Receive
• B. Transmit
• C. Lateral
• D. Angular

Answer: (B)

Transmit focusing relies on shaping the emitted beam with a curved wavefront produced by phased excitation of the array elements. By applying precise time delays (and sometimes amplitude weighting) to each element, the waves are synchronized so they arrive in phase at a chosen focal point. This causes energy to converge at that depth, creating a focused beam rather than a broad, unfocused pattern. Receiving focusing, by contrast, is done during signal reception by delaying and summing echoes to align their arrival times, not by how the transmit beam is formed. Lateral or angular describe the beam’s direction or width, not the mechanism of focusing through the transmit excitation.

Transmit focusing relies on shaping the emitted beam with a curved wavefront produced by phased excitation of the array elements. By applying precise time delays (and sometimes amplitude weighting) to each element, the waves are synchronized so they arrive in phase at a chosen focal point. This causes energy to converge at that depth, creating a focused beam rather than a broad, unfocused pattern. Receiving focusing, by contrast, is done during signal reception by delaying and summing echoes to align their arrival times, not by how the transmit beam is formed. Lateral or angular describe the beam’s direction or width, not the mechanism of focusing through the transmit excitation.