Pulse repetition frequency and depth of view are _______ related.

Pulse repetition frequency and depth of view are _______ related.

• A. Inversely
• B. Directly
• C. Not related
• D. Proportional

Answer: (A)

Pulse repetition frequency is determined by how long it takes for a ultrasound pulse to travel to the deepest point in the image and back. As depth increases, that round-trip time grows, so the system must space pulses further apart to avoid overlapping echoes. That means fewer pulses can be sent each second, lowering the PRF. In practical terms, PRF is roughly c/(2×depth), so doubling the depth halves the PRF. Because of this, deeper views correspond to a lower pulse repetition frequency, not a higher one.

Pulse repetition frequency is determined by how long it takes for a ultrasound pulse to travel to the deepest point in the image and back. As depth increases, that round-trip time grows, so the system must space pulses further apart to avoid overlapping echoes. That means fewer pulses can be sent each second, lowering the PRF. In practical terms, PRF is roughly c/(2×depth), so doubling the depth halves the PRF. Because of this, deeper views correspond to a lower pulse repetition frequency, not a higher one.