When you select one focal zone, how many pulse/listen cycles are required for each acoustic scan line in one image frame?

When you select one focal zone, how many pulse/listen cycles are required for each acoustic scan line in one image frame?

• A. Two
• B. One
• C. Four
• D. Eight

Answer: (B)

Focusing at a single depth means you only need one transmit event and one corresponding listen event for each scan line. The echoes gathered from that one focal depth are used to form the line in the image frame, so you don’t repeat the process for additional depths. That’s why only one pulse/listen cycle is required per acoustic scan line in one frame. If more focal zones were used, you’d perform additional pulse/listen cycles per line—two for two focal zones, four for four, and so on.

Focusing at a single depth means you only need one transmit event and one corresponding listen event for each scan line. The echoes gathered from that one focal depth are used to form the line in the image frame, so you don’t repeat the process for additional depths. That’s why only one pulse/listen cycle is required per acoustic scan line in one frame. If more focal zones were used, you’d perform additional pulse/listen cycles per line—two for two focal zones, four for four, and so on.