In linear phased array transducers, beam direction and focus are determined by

In linear phased array transducers, beam direction and focus are determined by

• A. The damping of each element
• B. The overall pattern
• C. The display settings
• D. The patient position

Answer: (B)

In a linear phased array, the beam’s direction and focus come from shaping the pattern of energy emitted by the entire array. By applying precise time delays (and amplitudes) to each element, the array’s excitation constructs an interference pattern that steers the main lobe to a chosen angle and concentrates energy at a specific depth. This overall radiated pattern is what sets where the beam goes and where it focuses. Damping an element mainly changes how strongly that element contributes and can affect sidelobes, but it doesn’t determine the steering or focal depth. Display settings and patient position don’t alter the actual beam physics.

In a linear phased array, the beam’s direction and focus come from shaping the pattern of energy emitted by the entire array. By applying precise time delays (and amplitudes) to each element, the array’s excitation constructs an interference pattern that steers the main lobe to a chosen angle and concentrates energy at a specific depth. This overall radiated pattern is what sets where the beam goes and where it focuses. Damping an element mainly changes how strongly that element contributes and can affect sidelobes, but it doesn’t determine the steering or focal depth. Display settings and patient position don’t alter the actual beam physics.