Which parameter is adjusted based on imaging depth to optimize imaging performance?

Which parameter is adjusted based on imaging depth to optimize imaging performance?

• A. PRF
• B. PRP
• C. Pulse amplitude
• D. Duty cycle

Answer: (A)

Imaging depth sets how long echoes take to return, so the system adjusts how often it sends pulses to match that timing. The parameter tuned for depth is the pulse repetition frequency. Deeper imaging means echoes take longer to come back, so PRF must be lowered (PRP increased) to avoid echoes from one pulse overlapping with the next and to maintain proper range sampling and Doppler sampling limits. At shallower depths you can use a higher PRF for a faster frame rate and better Doppler sensitivity. Pulse amplitude and duty cycle relate more to power and heating than to depth-based timing, and PRP is simply the reciprocal of PRF, changing as PRF changes.

Imaging depth sets how long echoes take to return, so the system adjusts how often it sends pulses to match that timing. The parameter tuned for depth is the pulse repetition frequency. Deeper imaging means echoes take longer to come back, so PRF must be lowered (PRP increased) to avoid echoes from one pulse overlapping with the next and to maintain proper range sampling and Doppler sampling limits. At shallower depths you can use a higher PRF for a faster frame rate and better Doppler sensitivity. Pulse amplitude and duty cycle relate more to power and heating than to depth-based timing, and PRP is simply the reciprocal of PRF, changing as PRF changes.