Which of the following actions yields a higher frame rate?

• A. Decrease the number of focal zones
• B. Decrease the line density
• C. Decrease the sector width
• D. All of the above

Answer: (D)

Frame rate is how many image frames can be displayed each second, and it increases when the amount of data needed per frame is reduced. Fewer focal zones mean you’re not performing extra focusing steps along each line, so each line is acquired faster. Lower line density means fewer scan lines to create the image, which cuts the data collected per frame. A narrower sector width reduces the angular range and the number of lines needed to fill the image, speeding up data acquisition. Because each of these changes reduces the workload per frame, applying all of them together gives the highest frame rate.