What is the disadvantage of using multiple transmit focal zones?

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Multiple Choice

What is the disadvantage of using multiple transmit focal zones?

Explanation:
Using multiple transmit focal zones is a trade‑off: it improves lateral resolution at multiple depths by focusing at several points, but it requires sending and receiving multiple focused beams for each line. This increases the time to acquire one frame, lowering the frame rate and thus the temporal resolution. The axial resolution is mainly set by pulse length and wavelength, and elevation resolution relates to slice thickness, so they aren’t directly degraded by using multiple focal zones. The key drawback is the slower frame rate, which makes it harder to track moving structures.

Using multiple transmit focal zones is a trade‑off: it improves lateral resolution at multiple depths by focusing at several points, but it requires sending and receiving multiple focused beams for each line. This increases the time to acquire one frame, lowering the frame rate and thus the temporal resolution. The axial resolution is mainly set by pulse length and wavelength, and elevation resolution relates to slice thickness, so they aren’t directly degraded by using multiple focal zones. The key drawback is the slower frame rate, which makes it harder to track moving structures.

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