You are using a linear array transducer with four transmit focal zones. How many pulses are required on each scan line to create the image?

You are using a linear array transducer with four transmit focal zones. How many pulses are required on each scan line to create the image?

• A. One
• B. Two
• C. Four
• D. Six

Answer: (C)

Multiple focal zones along a scan line are created by firing separate transmit pulses, each focused at a different depth. If there are four transmit focal zones, you need four distinct pulses per scan line to cover those depths. The echoes from each pulse are later combined to build the final image line, providing better lateral resolution at those depths. More pulses per line means more time per frame, lowering the frame rate, but it yields image detail across the four focal zones.

Multiple focal zones along a scan line are created by firing separate transmit pulses, each focused at a different depth. If there are four transmit focal zones, you need four distinct pulses per scan line to cover those depths. The echoes from each pulse are later combined to build the final image line, providing better lateral resolution at those depths. More pulses per line means more time per frame, lowering the frame rate, but it yields image detail across the four focal zones.