Pulse repetition frequency is defined as the number of what per second?

Pulse repetition frequency is defined as the number of what per second?

• A. Number of cycles per second
• B. Number of pulses per second
• C. Depth per second
• D. Amplitude per second

Answer: (B)

Pulse repetition frequency is the rate at which ultrasound pulses are emitted each second. Each emission is a pulse, so PRF counts how many pulses occur in one second, regardless of how many cycles are inside each pulse. The number of cycles per second describes the ultrasound wave frequency (the center frequency), not how often pulses are sent. So PRF being pulses per second is the correct description. Depth per second or amplitude per second don’t describe how often pulses are produced.

Pulse repetition frequency is the rate at which ultrasound pulses are emitted each second. Each emission is a pulse, so PRF counts how many pulses occur in one second, regardless of how many cycles are inside each pulse. The number of cycles per second describes the ultrasound wave frequency (the center frequency), not how often pulses are sent. So PRF being pulses per second is the correct description. Depth per second or amplitude per second don’t describe how often pulses are produced.