Which change would most directly increase the frame rate by reducing data collected along each scan line?

Which change would most directly increase the frame rate by reducing data collected along each scan line?

• A. Reduce the number of transmit focal zones
• B. Increase scan line density
• C. Increase the scanning depth
• D. Increase the transmit frequency

Answer: (A)

Frame rate is driven by how long it takes to acquire all the data for a frame, which depends on how much data is collected per scan line and how many lines are in a frame. Using fewer transmit focal zones means fewer separate transmit/receive events per line, so each line is acquired more quickly. That directly reduces the line time, and with the same number of lines, the entire frame takes less time to capture, increasing the frame rate. Raising scan line density would increase the amount of data per frame, slowing the rate at which frames can be produced. Increasing scanning depth lengthens the travel time for echoes and thus lengthens the time to acquire each line, reducing frame rate. Increasing transmit frequency improves resolution and penetration characteristics but does not directly shorten the data-acquisition time per line, so its effect on frame rate is not direct.

Frame rate is driven by how long it takes to acquire all the data for a frame, which depends on how much data is collected per scan line and how many lines are in a frame. Using fewer transmit focal zones means fewer separate transmit/receive events per line, so each line is acquired more quickly. That directly reduces the line time, and with the same number of lines, the entire frame takes less time to capture, increasing the frame rate.

Raising scan line density would increase the amount of data per frame, slowing the rate at which frames can be produced. Increasing scanning depth lengthens the travel time for echoes and thus lengthens the time to acquire each line, reducing frame rate. Increasing transmit frequency improves resolution and penetration characteristics but does not directly shorten the data-acquisition time per line, so its effect on frame rate is not direct.