PRF is related only to ______.

PRF is related only to ______.

• A. Depth of view
• B. Frequency
• C. Amplitude
• D. Depth of view

Answer: (D)

Pulse repetition frequency governs how often pulses are sent, and the limiting factor is the time it takes for echoes to travel to the deepest part of the image and return. That round-trip time depends on depth and the speed of sound in tissue, so the deeper you image, the longer you must wait before sending the next pulse. As a result, PRF is determined by depth of view: shallower depths allow higher PRF, while deeper depths require a lower PRF. The relation is roughly PRF ≈ c / (2 × depth), where c is the speed of sound in tissue. Frequency and amplitude describe the pulse's characteristics, not the timing between pulses, so they don’t set PRF.

Pulse repetition frequency governs how often pulses are sent, and the limiting factor is the time it takes for echoes to travel to the deepest part of the image and return. That round-trip time depends on depth and the speed of sound in tissue, so the deeper you image, the longer you must wait before sending the next pulse. As a result, PRF is determined by depth of view: shallower depths allow higher PRF, while deeper depths require a lower PRF. The relation is roughly PRF ≈ c / (2 × depth), where c is the speed of sound in tissue. Frequency and amplitude describe the pulse's characteristics, not the timing between pulses, so they don’t set PRF.