Which function is performed during both transmit and receive beam forming and is associated with the beam former and pulser?

Which function is performed during both transmit and receive beam forming and is associated with the beam former and pulser?

• A. Dynamic aperture
• B. Demodulation
• C. Pulse repetition frequency
• D. Time gain compensation

Answer: (A)

Dynamic aperture is the technique of changing the active number of array elements as the sound travels, to keep image quality consistent with depth. The pulser and the beam former work together to make this happen: the pulser decides which elements are excited, and the beam former coordinates how signals from those elements are aggregated, both on transmit and on receive. By expanding or narrowing the aperture with depth, lateral resolution and sensitivity are maintained where echoes are weaker and more spread out, which is essential for good image quality across the entire image. Demodulation happens after beamforming to extract the envelope, not during the beam forming process itself. Pulse repetition frequency relates to how often pulses are sent, a system timing parameter tied to the pulser, not the beam forming operation. Time gain compensation adjusts signal amplification with depth during receive, but it isn’t about forming or steering the beam. Dynamic aperture is the technique that directly ties the beam former and pulser to shaping the beam across depths.

Dynamic aperture is the technique of changing the active number of array elements as the sound travels, to keep image quality consistent with depth. The pulser and the beam former work together to make this happen: the pulser decides which elements are excited, and the beam former coordinates how signals from those elements are aggregated, both on transmit and on receive. By expanding or narrowing the aperture with depth, lateral resolution and sensitivity are maintained where echoes are weaker and more spread out, which is essential for good image quality across the entire image.

Demodulation happens after beamforming to extract the envelope, not during the beam forming process itself. Pulse repetition frequency relates to how often pulses are sent, a system timing parameter tied to the pulser, not the beam forming operation. Time gain compensation adjusts signal amplification with depth during receive, but it isn’t about forming or steering the beam. Dynamic aperture is the technique that directly ties the beam former and pulser to shaping the beam across depths.