What is the primary disadvantage of using multiple transmit focal zones?

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Prepare for the Ultrasound Transducers Test with flashcards and multiple-choice questions. Each question includes hints and explanations to help you pass with confidence.

Multiple Choice

What is the primary disadvantage of using multiple transmit focal zones?

Explanation:
Using multiple transmit focal zones creates a trade-off between lateral and temporal resolution. Focusing at several depths sharpens the image laterally across a broader range, but it requires sending and receiving more pulses to cover all those focal points for every line of the image. That extra data collection takes more time, so the frame rate drops and temporal resolution decreases. Axial resolution depends mainly on pulse length and bandwidth, and elevational resolution is tied to beam thickness, not the number of focal zones, so they aren’t the primary downside here.

Using multiple transmit focal zones creates a trade-off between lateral and temporal resolution. Focusing at several depths sharpens the image laterally across a broader range, but it requires sending and receiving more pulses to cover all those focal points for every line of the image. That extra data collection takes more time, so the frame rate drops and temporal resolution decreases. Axial resolution depends mainly on pulse length and bandwidth, and elevational resolution is tied to beam thickness, not the number of focal zones, so they aren’t the primary downside here.

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