As depth of view increases, pulse repetition period _______.

As depth of view increases, pulse repetition period _______.

• A. Increases
• B. Decreases
• C. Stays same
• D. Fluctuates

Answer: (A)

Pulse repetition period is the time between successive ultrasound pulses. When you look deeper, echoes from the farthest structures take longer to return. The system must wait for those echoes to arrive before sending the next pulse, so the interval between pulses gets longer as depth increases. In soft tissue, PRP is roughly 2 × depth divided by the speed of sound, so doubling depth roughly doubles the PRP. This longer PRP lowers the pulse repetition frequency and can reduce frame rate, but it prevents range ambiguity and allows accurate imaging of deeper structures.

Pulse repetition period is the time between successive ultrasound pulses. When you look deeper, echoes from the farthest structures take longer to return. The system must wait for those echoes to arrive before sending the next pulse, so the interval between pulses gets longer as depth increases. In soft tissue, PRP is roughly 2 × depth divided by the speed of sound, so doubling depth roughly doubles the PRP. This longer PRP lowers the pulse repetition frequency and can reduce frame rate, but it prevents range ambiguity and allows accurate imaging of deeper structures.