The term for focusing during transmission by adjusting the phase of emitted waves from the array elements?

The term for focusing during transmission by adjusting the phase of emitted waves from the array elements?

• A. Transmit focusing
• B. Dynamic receive focusing
• C. Aperture focusing
• D. Mechanical focusing

Answer: (A)

Focusing during transmission is achieved by electronic beamforming: you apply precise time delays (phase shifts) to the signals from each array element so the emitted waves converge at a chosen focal point. This creates a focused transmit beam and improves lateral resolution at that depth. The term for this is transmit focusing. Dynamic receive focusing uses delays during the received signals to focus the image after transmission, so it’s about the reception process rather than how the beam was emitted. Aperture focusing relates to how the array’s active area contributes to focusing, not specifically the phase-adjusted emission, while mechanical focusing relies on a physical lens or curved element rather than electronic delays.

Focusing during transmission is achieved by electronic beamforming: you apply precise time delays (phase shifts) to the signals from each array element so the emitted waves converge at a chosen focal point. This creates a focused transmit beam and improves lateral resolution at that depth. The term for this is transmit focusing.

Dynamic receive focusing uses delays during the received signals to focus the image after transmission, so it’s about the reception process rather than how the beam was emitted. Aperture focusing relates to how the array’s active area contributes to focusing, not specifically the phase-adjusted emission, while mechanical focusing relies on a physical lens or curved element rather than electronic delays.