A method used to improve frame rates with multizone electronic focusing is termed:

• A. Apodization
• B. Parallel processing
• C. F-number focusing
• D. Low-Q transducers

Answer: (B)

Parallel processing is used to boost frame rates when using multizone electronic focusing because beamforming calculations for multiple zones can be handled at the same time rather than one after another. Multizone focusing splits the aperture into several zones, each requiring different delays and signal combination during transmission and reception, which is computationally intensive. By distributing these tasks across multiple processors (such as DSPs or GPUs) and processing different zones or data streams in parallel, the system can generate frames more quickly and maintain real-time imaging. Apodization is about amplitude weighting to reduce sidelobes, not speed. F-number focusing concerns the aperture geometry and depth of focus, not processing speed. Low-Q transducers relate to bandwidth and quality factor, not frame-rate enhancement via parallel computing.